I agree with the poster above me, the only thing trusts are good for during bosses fight are getting to the safe spots for mechanics, sometimes they move in advance but sometimes they also move at the last second, so playing with them requires you to actually understand the mechanics if you don't wanna waste time wiping. Those mechanics arent really reaction heavy, they mostly have tells that are different from just an orange puddle on the floor, its usually + or O, electricity lines, RP text for the last boss, and in general paying attention to surroundings those are the things that need to be reacted and there's usually some time between when those things get on screen and when the mechanic resolves

Duty finder might honestly be the better option for the OP, you get punished less for stacking vulns or dying, you can get healed/res'd and it will make the dungeon take 20-30mins

Easy mode is also an option but expect patches/expac to take longer if those would be implemented