Sure, but the person I was replying to seemed to imply that there is some lack of interoperability of apps in the Fediverse when the whole point of the Fediverse is interoperability not just between the different apps, but even different servers sharing the same protocol

They seem to have misunderstood that just because .ml decided to defederate from Kbin, they will never be able to interact with Kbin posts and comments on Lemmy when in reality you can just sign up on another instance and it works just fine. Or you host your own, and you control what you see