I'm glad this thread exists because I have been finding this game incredibly difficult. I think part of it is 1: I don't like Shadowheart or Lae'zel and my player character is a ranger so I'm running with all squish, no tank, no heals. On top of that I like to persuade/intimidate/deceive my way through encounters which doesn't net exp.
When I do have to get into a fight I feel massively disadvantaged compared to the enemies and I'm lucky if I can ever hit anything--my hit chances are so low. If this is the result of party composition/under-leveling then I feel like I'm being punished for playing the way I want to play. Having difficulty tiers will definitely be good but doesn't address the problems that may be causing my run to be so challenging.