You can tell Act 3 had the least amount of polish put into it. Act 1 and 2 feel very carefully and intentionally designed. You can tell they planned everything out. Act 3 feels like it was rushed and they had to make a lot of compromises.
The pacing is the most obvious thing but there’s also stuff like why is Gortash, the literal ruler of the city, being sworn into power in a random fort in the lower city instead of you know… the actual castle?