Imagine what if every website implemented HTTP/TLS themselves. There would be so much fragmentation that we wouldn't see the #interoperability we see today.
To me, that's what the #fediverse looks like today. Mastodon, Pixelfed, etc. have their own implementations of #ActivityPub, WebFinger, HTTP Signatures, etc. and each one behaves slightly differently, which leads to poor interoperability. Adoption of new standards is slow.
I wish each major programming language had something like #Fedify.