Sure, I understand why people want blocking. At the moment.
Once webs of trust, sovereign, self-served clients, and personal relays reach their full potential, they won't "want blocking" anymore or even think about it.
Even if blocking was somehow not difficult on Nostr-as-a-protocol (impossible, as already discussed), I would still rail against it as a norm and would encourage forking-away from anything that implemented it. It makes me uncomfortable that it's even perceived as being glanced at, side-eye. The fact that I can voice my opinion in a way that nobody except the listener can stifle is the reason we're here.
Mute is post-facto. Some people get so many replies that they don't want that mute isn't enough for them. They don't want to see them in the first place.
For this we can/should have community mute lists (which some people are calling 'block') that takes input from labelling/reporting (NIP-32, NIP-56) and has community moderators, which are subscribed to by like-minded people. Those community mutes won't affect you and me because we won't subscribe to them, but for people who trust their in-group, they can have such group mute lists. Most people in those groups won't see most offending posts, so it serves their purpose.
I just made a post going over many of the options:
nostr:nevent1qqsvl4ylsr46mw426hzyjlffuw67vz7vqf7x0w2klgt6pmsm87u59wqpypmhxue69uhkx6r0wf6hxtndd94k2erfd3nk2u3wvdhk6w35xs6z7qgwwaehxw309ahx7uewd3hkctcpypmhxue69uhkummnw3ezuetfde6kuer6wasku7nfvuh8xurpvdjj7pvgtq8
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