1. The initiative system...
2. The number of enemies...
3. The all-knowing AI...
4. Movement and range...
5. The out of combat movement...
6. Glitches, bugs and exploits: While this is EA I understand it, but at the moment each fight can easily be cheesed or bug out on you. Whenever I wanted to place my party beforehand the hag would simply not appear. I had Mayrina fall to death in her burning cage, because no character could have realistically reach the button in two turns, and even then it would likely have needed a turn of her to get out of it. Throwing water barrels from certain positions did not work multiple times, it would simply not throw for no apparent reason, or it would deal damage to the cage, making it fall. It worked with the Water spell, though. The fight was so frustrating, random and glitched, that I just initiated combat with one character and while no enemy could move because of turn-based, my rogue sneaked in, which makes no sense, and pushed her into the underdark. For the Matriarch I just destroyed the eggs from stealth and her as well. I do not know if this was all working as intended.
1) I find the initiative system is what keeps the combat fun and exciting . . . having to react to how things playout is a fun challenge . . . it forces you to get creative. With fixed turns you just use the same pre-planned strategy every time.
2) Again it forces you to plan and adapt . . . crowd control, clear out the adds, or focus on the boss. Or perhaps run away to a choke point. . . or better yet start the combat from a better position.
3) We know everything also, except monster abilities but those can usually be looked up in the D&D rules if you like. But its fun to be surprised!
4) I actually think they have nailed the movement/scale. Faster movement would let people run all over and things get way out of control (see Divinity Original Sin 2) and there is very little teleporting (sure phase spiders, but that's their thing)
5) I think a 'Unlink ALL' button would be really great. But I don't generally have any difficulty moving people into position. . . and never use the out of combat turn based movement. Unlink everyone, put them all into sneak, and move each to where you want to go avoiding enemy vision cones. I've really not had issues with this.
6) Agreed, bugs and Mayrina is a pain and flat out crazy . . . let her die!