The issue for me is that every fight is balanced like DOS2 in that every single one can potentially cause a TPK. This is fine in Divinity, but in 5e every fight does not need to be so difficult. If this was an actual campaign of this difficulty, then this DM would have no players.
I would say that I completely disagree.
If the players do not feel there is risk, then it's a boring campaign. If the players feel they can just waltz into any fight and win them all or win most, then it's very poor DMing.
One of the things I loved about Divinity Original Sin was that you really had to THINK about what you were doing. It made me grateful for a turn based game, so that I could actually use some strategy (and kudos for the environmental effects).
So far, there have been a few fights where if we had not used stealth and planning, we would be dead. Very very exhilarating!!