I believe someone posted here that in another of their games the enemies moved faster once the game was released. Hopefully this will be the case with this game as well.
I bet the issue is that they are trying to make it so enemies are smart so that the game is more challenging.
Definitely hoping they add this smartness when it comes to stealth.
Yeah how is stealth so broken?
I started soloing the game with an Eldritch Knight in Scale Mail who definitely isn't any kind of stealth character at those levels. You can stealth-murder most encounters without even actually rolling a Stealth check. Enemies don't even get to fight. I killed all of the undead in the first temple by just staying out of their vision cones and ending every turn in stealth. They never attacked me.
Then if you try being sneaky with terrain, it easily results in the enemy not knowing what to do and just sitting there waiting to die. Like the 3 ogres. I went on the roof and all they could do was throw chairs at the ceiling while I was slowly killing them with arrows and Fire Bolts.