I'm feeling like they could just double the PA and/or increase the initiative of enemies and it would help balance out some things. It's hard to pass endgame judgement on first act samples but I know in my gaming experiences there's been a lot of times that melee shines early and as the game gets harder the magic classes start to become more powerful (Diablo I is one of my favorite examples).
I thought that Necro was sorta designed to be a magic caster that works well in melee heavy groups, I would definitely like more physical damage spells for all the classes though (Landslide/Rock Throw - Geo, Melt/Rust/Crush Armor - Hydro/Pyro/Aero). The best thing about this game imo is the variety that you can experience. I just hope they make harder difficulties brutal so that you can't just backlash/cloak your way to victory.