Because the NIP-01 stuff isn't supposed to be versioned, as it's the Twitter-clone base and for some reason, they don't want us editing our posts. (Everyone wants this, but oh well.)
Discussion
Come on, NIP-01 still is in draft. I think *every* event should be (optionally) versioned, with the most recent version being the "source of truth" unless stated otherwise. Current clients can just ignore these fields if they don't want this functionality...
I'm not the one who isn't implementing it. 🤷