Man, how bad can this be?
1 - Bows are hard to aim, they don't have an iron sight and need to be drawn and maintained like that. One of the advantages of a crossbow was an easier aiming, and this is important because a weapon easier to aim makes the training faster. And to say a snipe rifle is hard to aim is ridiculous, the damn thing has an iron sight and some have a scope as well. That entire panel is ridiculous.
2 - The suppressor is more expensive than the rifle? How ridiculous can this get?
3 - She is a sniper, she isn't supposed to get in the range of the enemies, so her "armor" (if it can really be called that, I don't see any leather or metal at least) is wasted on her. He on the other hand is a spearman, a frontliner. He will be at the enemy's range, and as such needs better protection. The slave having better equipment than the master worked on Shield Hero (which is your inspiration, don't lie), because Raphtalia was a swordswoman, a frontliner, and Naofumi already had the Shield giving him full protection.
4 - Please, please, author, read goblin slayer. If you had, you'd know that spears are the best weapon in caves. It's big, but you don't swing it around, like a sword. You thrust with it, and there is plenty of space in front of you. You can even shorter the range if you want by holding the middle.
I'm at one chapter of dropping this manga. The author not only doesn't know a thing about warfare, but his story is shallow at best.