I already talked about why that matters in my post (didn’t mention anything about a person’s importance), but I’m happy to clarify and expand on it!
To summarize again, this would allow users to follow a person across platforms. Part of the benefit of the fediverse is I can choose to get content from a microblogging platform as well as macro blogging or threaded like lemmy. It would be a good feature for me to be able to follow someone across all federated platforms without having to scavenge for them.
Moreover, it would allow me to use other types of platforms without having to sign up on each one. This would also be useful for instance admins. If instance A trusts instance B, then it can allow instance B users to sign in without having to sign up separately.
This could also mean that instance A could be an identity provider only