We (ZeroTier) dragged our feet on this stuff for a long time because we are personally of your mindset, but we get asked for it a lot so more of it will be coming. The ability to use your own auth and your own other things will never go away though, and with ZT you can run a fully independent network controller if you want.

Personally I want ZT to integrate support for integrated (e.g. Apple security chip) and discrete (YubiKey etc.) secure tokens and enclaves. That is where the real security is at.