SideFX have some compatibility flexibility around this with Houdini but they're the exception. Autodesk have very tight annual release schedules for Maya (and other DCC), where the actual feature development only has months allocated (and several months for beta). They rarely skip years too with 2020 being the last one.

> Even if it means them say - this is very unstable, use with caution.

AFAIK, the entire point of that reference platform is that nothing is "very unstable" or even "unstable" but instead a stable target to develop against. I'm guessing adding something like that would defeat the purpose somehow, and risk getting studios vary enough to make it not worth it.