I'm not trying to treat you like you're stupid or to gaslight you. There is a "slice" of this that is absolutely a native, Chrome-only interface, but I just don't think that this is particularly exceptional. These sorts of Firefox-only APIs exist as well in order to support Mozilla's goals, and this is quite normal - you wouldn't expect every single aspect of the browser to be built in lockstep with every other browser.

For the most part, Mozilla could build out Endpoint Verification (and it supports a subset of the APIs anyways). Similarly, there could be a web proposal for device attestation APIs that are more generalized, etc, which I think would be great.