Wow. I kinda swore off most of the grenade type weapons early on...
the fights in the video were actually very challenging and draining for me... especially the gith...
crazy to see what they can really do with some attention to using them tactically...
That's how combats works at the moment : just learn a few OP custom mechanics and everything that was more or less hard just become (very) easy...
I had the same experience than you on the first time. Everything was very hard and frustrating. Then I learned about backstab, highground, dipping, jumping,... And every combats became easy, uninterresting and determined by a few things that doesn't belong to D&D.