I suspect he knows this is a horrible idea that will drive more people from the site. It's a desperation move: engagement with paid "verified" accounts is dismal, he's hoping unblockable promoted replies will convince more trolls, spammers, and propagandists to stick with it.
@maxkennerly Blocking in twitter only works if you go private. Otherwise, the blockee just logs into another browser and looks at the public output. So, he does have a point (this time). However, in the end, I agree that it's likely going to drive more people away.

@herr_jason @maxkennerly

It isn’t pointless. The person who imposed the block no longer sees the blocked person’s tweets, and the blocked person can’t tweet at the blocker.

Who cares if the blocked person can see the person’s tweets if they can only do so impotently?

“Oh but the blocked person can still see the text of the person’s tweets and use that to organize harassment” you say. Well, the blocked person could see it in other ways as well.

@jonhendry @herr_jason @maxkennerly and I assume this is what Mr Musk is worried about. Blocking keeps the blockee from tweeting and keeps their hate posts from being seen by others. Mute keeps the hate posts going ...

@colo_lee @herr_jason @maxkennerly

Right. The vast majority of blocks aren't of persistent harassers by high-profile (or "jerk magnet") accounts. They're of the "Just based on [that toot/their bio] I don't care to ever deal with this person" sort.

@jonhendry @colo_lee @herr_jason @maxkennerly what got me to be aggressive was brigading, aggressively blocking adversarial accounts dramatically reduced how often I got put in twitmo.