But hasn't this gotten very similar to the upstream AOSP 10 app settings? I know they are somewhat hidden, but you can change a lot about an App's behaviour and even fake location data for a specific App.

I didn't use Lineage with Privacy Guard (too old or too new devices)... so what's the TLDR on the featureset that's missing?

Might be worth creating an alternative for 10+ if there isn't any.