The problem exists in all of BG3, but act 3 is especially bad as the stakes have been raised while the side quests become even more menial and disconnected from the main plot.
In act 2 side quests were either directly rescuing people, related to Daniel or finding out information about Ketheric, like the encounter with his family.
In act 3 you chase pidgeons and piece together a clown corpse for a circus.
