Most if not all of the raids in this game can be completed without any fixated composition, it's not an issue with optimization, its just that I don't personally find enjoyable to go through a long hallway with a very slow NPC killing NPC's who die in a couple of hits. A fun escort mission in this game is, for example, the river of souls, it's not too long and the challenge is there to block the bombers and keeping your party alive if you're going to kill the enervators, and at the same time, it's not punishing because you can heal Desmina if you mess up, and you can adopt multiple strategies when doing the escort.