"the ridiculous mana needed to stream however long he wants!" that is the dumbest fucking thing ive ever heard. you dont need to have it be mana, you dont even need to explain it in depth, it can just be his one skill and thats that.
Okay, that's rude. And you're just forcing your preferable setting. Maybe you like sci-fi better, but if the author wants to use fantasy setting with magic and all, isn't it normal if they used mana? Otherwise they'd perhaps write the MC as a engineer or mechanic with a cheat skill capable enough to build an immensely powerful electric generator instead.
the "UNLIMITED MANA AND POWER RESERVED ONLY FOR THE TRUE ELITE OF SOCIETY" is going to be used to yank him from any form of plot based consaquances the author isnt smart enough to write.
Isn't giving a character a skill or boost to force the story is something that a lot of authors do? If it happens at the beginning, it's called a cheat. If it happens later, it's called a plot armor. If the enemy is the one who got it, it's called a twist. The point of this manga is clearly not about politic so quickly removing the aspect of eliteness of the society isn't wrong, if that's what the author wants. Afterall, this is a light manga with comedy and romance genre focus. You wouldn't know yet if there won't be any "plot consequences" considering that the plot is about yanderes and not about living in society, and "real consequences" is usually something that won't be covered seriously in this type of manga.
they want the charismatic streamer that makes people obsessed with him but they cant actully write someone like that.
What's considered charismatic is subjective based on community, so what our world considers charismatic wouldn't always be the same in every other worlds. The author made it so that MC's rather crude way of talking is considered fresh and very charismatic in that world that has minimum entertainments (it even looks like there's no dedicated TV shows), so couldn't we just accept that as the setting?
so you are going to watch them use their unlimited power to meet random girls and they are going to be randomly obsessed with him after five seconds of either meeting him or listening to him spout shit teir anime opinions while "epic styling" on random ass mobs.
Alright, what hurt you? Nothing like that has happened yet, and the Princess was shown to love MC after hearing numerous streams - same with every other guys and girls who came to like him. About "shit tier" anime opinions, that world is apparently not advanced enough for anime to exist, so "shit tier" doesn't really exist yet. Unless it's "shit tier" in our world? But that means that you'd also dislike lots of isekai stories where the MC utilized knowledge or things from their original world.