The only thing I'd add here is that those who want to defederate from Threads have every right to do so, Facebook/Meta is an awful, awful company.
Those who want to be able to stay in touch with their family and friends who don't wish to join other fediverse platforms (yet) can do so easily.
Heck, you can even start your own fediverse community for $1-2/a month per person, and set your own rules. What a bargain!