"Block" is trivially bypassed by using a logged out tab. It's ok and good to say "I don't want to see their words". It's foolish to try to demand and enforce "they are not allowed to see my words". If you don't want people you don't like to see your posts, don't post.
It may be more about others not seeing the blocked in vicinity of the blocker, not finding and amplifying each other. Also it is about the blocker not having to see the blocked, although for that, muting would suffice. Also blocking leads to isolation, which is punishing.
