Then I think I fail to see what you mean and want.
The PR is meant to be able to block an instance as a user but you seem to think that it is about finding an instance and blocking that? I see no real purpose in such a feature tbh.
This is not how I understood the new feature but again, I could be wrong.
I will await the new feature and hope and pray it is what I think it is.
If the admin of an instance A defederates instance B, all users on instance A will no longer see instance B.
However, other instances (like for example instance C) will still see the comments/users from instance B.
The user being able to block instance B will no longer see anything from that instance B but all other users on instance A will keep seeing all from instance B. It is a personal instance block after all
This is how I understood the user instance blocking and it kinda aligns on how I think the fediverse works. But I could be wrong.
I understand what you do and what you mean with this post but it will be futile. Hexbear and lemmygrad are toxic instances where you cannot have a proper conversation with its users.
I call it the 4chan style of discussing things. Make you answer a plethora of questions without them needing to answer your questions. The point is to pit you constantly on the back-foot. They count on your morals and decency to keep answering and defending your opinions where they will absolutely have no desire to do the same thing. The end goal is for you to become frustrated and give up. For you to become disheartened.
I urge all instance owners to defederate from these shitholes, nothing of value will be lost.