But how is this worse? If you run an agent now, it will run with your privileges. If you run an agent after this feature, it will run with limited privileges as specified by you.

Heaps of ranting here about agents sucking down private data to Microsoft servers without your knowledge, where a cursory look at this feature is to give you more control if you actually want to use agents. Sure, it might be learned reflex behavior, but that is exactly what OP was talking about.

It's worse because they're exposing these features to the kind of people who aren't running agents now.