Likely the closest I could picture in a modern sense is Jacob Collier, who can indeed perform these types of musical feats. But the crux of the issue is that while Collier is much loved, he isn’t a dominant force of popular music like Mozart was.

Pneumonoultramicroscopicsilicovolcanokenosis. Blow their minds.

I don’t think that’s true. Unless it’s a server side server denial rather than defederation, all posts on Lemmy are public. This means Threads will directly receive updates even from defederated instances.

It’s blatantly wrong. Google extended XMPP for their own purposes and when participating with XMPP no longer suited them, they left. The collapse of the “XMPP userbase” is a misnomer - those users were never XMPP users. They were Google Chat users. When Google left, XMPP was in the same state it was in before Google got on board. It returned to its status as a niche protocol for a service that, as @effingjoe@kbin.social points out, people didn’t really want anymore.

Defederating is a one-way transaction. Any instance that defederates from Threads will only stop themselves from receiving data from it, but Threads will still be able to pull data directly from any and all instances.