So, on one hand, yes. absolutely agreed, on all counts.
On the other hand, the point of social media is to engage with people. What if your mom has an account on meta's new activitypub platform? Is the interoperability of these platforms not also a huge feature? What if I want to follow my mom on mastodon when she's on facebook whatever, but not give meta my data? These all work best when we can protect ourselves and engage responsibly, and defederation/blocking at a server level, while a WONDERFUL emergency button, also rejects a lot of the funcitonality and beauty of the fediverse. And I think there's probably room to find a middle ground that protects users well while still letting them have that sort of engagement?