It's not just that. It's a model for identity continuation. Using Kind 1s for this is the wrong approach by far. They are overloaded and can easily get lost in the feed. A specific kind for identity checkpoints would have cleaner semantics and could be rendered in a feed. There's also no hard requirement for OTS, and if it is used, clients can always rely on a client that renders it with a rich UI/UX, like NIP-89 does. In any case, I'm not here to convince anyone. I've never liked politics.

People are using all kinds for this, not just kind one. It's not about kind 1 at all. They use whatever kind is available in the app they use. It's about ease of use and integrity of identity across all apps and all relays.