Let's hope Apple and Google remove X when it drops the block feature. Because I'd love to see Musk poor a few billion into fighting the obvious anti-trust issue here.
I also think the feature is naive and too easy to abuse by charlatans, who use it to make their replies a paradise of yes-persons.
That said, muting does not fully solve the problem of harassment in threads. He doesn't give a fuck about that, that's the real reason, even if there are technically valid arguments at play here.