Calling user blocks impossible is a pretty limited view. The entire premise of removing the block feature is a marketing gimmick by Elon btw, people are eating it up giving free engagement, even though the community notes on his original post pointed out it was fake. This is like when IHOP pretended to change their name just to get people to post about them. A platform of open interactions with no means of limiting is like a car with no breaks. There is no reason why nostr can't strive after and expand on the model set in adblockers like uBlock with simple list selection.