One thing that makes me wonder is why anyone thinks random encounters are a threat?
They are practically always regular time grabbers (especially in a turn-based game).
Probably the perfect example would be pathfinder. About 95% of the random encounters in this game are literally a waste of the player's time, the rest of them are actually scripted.
This is a junk mechanic that shouldn't be in this game, especially since it's fully turn-based.
As for time constraints, it is such a popular mechanic that the new pathfinder practically does not have them. Some tasks are simply marked that they must be completed by the end of the chapter.
Which just means it works the way it will ultimately be in bg3.