If you do Forgotten Gods immediately after the first ACT, the other act (2) provides 0% xp, kind of boring to play without getting any xp.
Maybe some scaling is necessary so you get something and motivates you to play and kill monsters.
then crate probably needs to crank up the levels of act 2 and beyond enemies,
but only if the player decides to finish fg first before continuing act 2.
this isn’t a problem on ultimate though, since enemy levels scale dynamically at that difficulty.