Why do people hate levelscaling? What will happen to D:OS if enemies have a minimum level and will still be notable when you completed other quests before you return?
Why do I hate levelscaling in Skyrim: I see a Wolves at level 3 and barely kill them. Later, at level 10 I see more Wolves, consider how much I must have improved and get killed because I unjustifiably "overextended myself". Same goes to Areas. You remember the common pattern that in a specific region, there are weak enemies. 20 levels later, when you return, the enemies are stronger and of different type than what you (justifiably) expect them to be. Every place feels just the same. Or worse: Oblivion where higher difficulty is set equal to higher enemy health.
Regarding D:OS: The points above more or less do not apply here. You will witness every encounter and area once. Orcs are level 2 in the beginning iirc, 6-8 at the western beach, and level 12-14 later in the game. Always being around your current level. Isn't that a bit like levelscaling already?
If people find a specific encounter too challenging and they are at the correct level already, why don't they reduce the difficiluty like I often did in BG2?
One point against levelscaling I agree to is when you replay the game and try to plan ahead. That will feel awkward. I am not sure if it is a thing, though.
It was a real letdown for me when I realised I had skipped the crab boss battle, although I have already been overleveling the other content east of Cyseal. It is no fun beating a boss down and all his awesome attacks and scripted events are a waste of time. It is like playing Zelda with 99 general keys. So for me, levelscaling or similars (like asymmetric combat bonuses) are ok specifically in D:OS as long as there still is a "level wall".
Respawning in its pure form will create redundant content. "Respawn" does not need to mean encounter. You can fill largely depopularized areas with kith: beggars, rabbits, deer,.. anything that creates the illusion of liveliness. As long as it does not hinder travel it is very fine.