I installed Adguard myself after reading this post — it appears as though they've split the functionality into many extensions, and only a few require full-page access. I'm trying it without those "advanced" extensions enabled and it seems to be doing just fine.

No because Safari is my “web browser”. It’s the one I use for HN/Reddit etc. Anything I’d consider “private” like email or banking or even GitHub is done with FireFox or Chrome.

Also I didn’t see anything flagrantly bad at first glance.

Edit: Looking closer you may be referring to the old extension and not the new “content blocker” version, which is sandboxed by Safari and didn’t need to ask for any permissions.