Honzuki no Gekokujou: Shisho ni Naru tame ni wa Shudan o Erandeiraremasen—Dai-4 Bu: Kizokuin no Toshokan o Sukuitai! - Ch. 28 - Treasure stealing dit…

[LiAuN]

Actually it has!
We saw explosion spells before and know that "barrier" spells exists and can be given effects. Also wind spells that cut was also shown before.
The magic system in this story is way more "open" than anyone reading it here seems to want to admit never with a good reason and always defaulting to "but we didn't see that being done in the story" despise you don't needing to have something in the story for it to be possible within the rules of it.

problem is the vary vast majority of the spells that you are refering were cast by either RM or Ferdinand and to consume such a massive amount of mana that you wouldn't be able to last long. it's not that there aren't options it's that the options you propose aren't viable. just for example it is stated directly in the series that the volley that Ferdinand used during the trombe hunt an ADULT archnoble would only be able to produce a couple of those volleys at best. RM and Ferdinand are just busted mana wise that's why they could do that stuff. also we didn't see explosion spells (because there are none) there are however explosive magic tools and those are secret for obvious reasons so develpoment of those aren't shared because they could easily be used against you and noone in charge wants that. you are absolutely correct that the system is a lot more "open" then most in the universe know hell it's practically one of the most open power systems out there but just because it's open doesn't mean it's not structured and comes with rules. rules that would apply and are the reason why most of these things couldn't be applicable

 

[PerfectDeath]

Actually it has!
We saw explosion spells before and know that "barrier" spells exists and can be given effects. Also wind spells that cut was also shown before.
The magic system in this story is way more "open" than anyone reading it here seems to want to admit never with a good reason and always defaulting to "but we didn't see that being done in the story" despise you don't needing to have something in the story for it to be possible within the rules of it.

To clarify, I was mostly referring to the blizzard. We do see some big AoE mana blasts that are used by Archnobles and above. We see that from Karstedt and his sons. xD
But people gotta chug mana recovery potions right after use.
The Net is something that can be done by turning their wand into one but is a more specialized tool that most nobles don't seem interested to learn/use in the Academy's ditter. Most of this section of the story is to set up so that a lot of what you brought up are things to improve on. "We didn't see that being done in the story" can mean either it cannot be done or that it can but no one in the Academy has thought of doing so. Could also be that no one has developed the spell yet either even if it is possible to make something like a blizzard spell. There is open space for it, there just needs to be the innovation, which is a core part of the story progression.

 

[mahtan]

problem is the vary vast majority of the spells that you are refering were cast by either RM or Ferdinand and to consume such a massive amount of mana that you wouldn't be able to last long. it's not that there aren't options it's that the options you propose aren't viable. just for example it is stated directly in the series that the volley that Ferdinand used during the trombe hunt an ADULT archnoble would only be able to produce a couple of those volleys at best. RM and Ferdinand are just busted mana wise that's why they could do that stuff. also we didn't see explosion spells (because there are none) there are however explosive magic tools and those are secret for obvious reasons so develpoment of those aren't shared because they could easily be used against you and noone in charge wants that. you are absolutely correct that the system is a lot more "open" then most in the universe know hell it's practically one of the most open power systems out there but just because it's open doesn't mean it's not structured and comes with rules. rules that would apply and are the reason why most of these things couldn't be applicable

The whole mana consumption argument is... I was going to say "stupid" but I guess that would be too much, but they aren't good arguments because the mana problem is all caused by lack of use and lack of research on the spells. The magic system shows that using magic makes it easier to use more magic and that magic capacity can be increased, there is nothing stopping them from training to use those spells and/or researching ways to use less mana for the spells.
My problem with the setting is how dismissive the character are of MAGIC with no one being shown interested in training it's use or using it in day to day life.

 

[LiAuN]

The whole mana consumption argument is... I was going to say "stupid" but I guess that would be too much, but they aren't good arguments because the mana problem is all caused by lack of use and lack of research on the spells. The magic system shows that using magic makes it easier to use more magic and that magic capacity can be increased, there is nothing stopping them from training to use those spells and/or researching ways to use less mana for the spells.
My problem with the setting is how dismissive the character are of MAGIC with no one being shown interested in training it's use or using it in day to day life.

this is directly disproven using magic doesn't in any way make it easier to use more magic what it does improve is consitant imaging not the cost of it. the cost is always the same for the same spell.
2nd you can't just compress willy nilly this is something that doesn't concern Myne because she lacks agency in the area where it's influential but the most important thing is that the basic rule of the world is that you can't have kids when there's a more then 25% difference in the total mana capacity between ppl on top of that you have the political differences in rank to consider.
3rd there are ways to reduce the mana expenditure of spells in 1 of 2 ways 1st is by condensing the spell but that also heavily reduces the effectiveness. for example

Spoiler: spell condencasion

there is a prayer for the blessing of the god of darkness and there is a spell for it. the spell is a condensed version of the prayer but for that there are many drawbacks such as it stealing only 2x the ammount of mana as opposed to 5x as well as the inability to transform your shtappe into a different weapon when it was cast without first dismissing the spell and also the spell unlike the prayer being limited to 1 time per day

the 2nd way to reduce it is by getting a lot of protections problem is with the way the temple is seen that's practically a no go.