@grishka sure, and can't blame you in the slightest. It does not really matter how the process is set up, and if things are documented before or after the fact. You participate in discussions, and FEP process, which is more than many others do.
Also the fedi specs work best if ones use cases are already well represented, and just need some tweaks and extension here and there. But if widespread, rich interop is where your app starts off and thrives, its a much more risky bet to 'just start'.