I get you, though it's mostly a problem if the userbase is split (I suppose it is, I'm unfamiliar). If so, it's a long-term problem only if one does not eat the other. Having a mainstream protocol/stack is a good thing.
Sadly, convenience always wins, and most people need a better reason to "switch platforms" (which is, ironically, what moving your socials to atproto/fedi means). Together with the dismal state of general education on digital independence, such revolutions just won't happen for the overwhelming majority of internet users. The lack of GPG usage is a common example, but people don't even own their email domains :)