(Note that I am not sure how much of this is depends on my client - Voyager.)

Ability to filter out posts made by people from the instances I have blocked, on communities that I did not block.

For example: feddit.org seems to have blocked all IPs from my country so I cannot see any posts made by them (I can only see their crossposts).

However, people on that instance can post to lemmy.world and while I can see the post text, any media fails to load. Sometimes, when I am not lazy, I use a VPN to see such posts in detail.