I agree with Niko - chart support shouldn't be a hard line for experimental/stable for core features. We should get it into a released chart though :) It hasn't gotten enough attention from me recently. That said, I am close to cutting 1.16.0.
I love the idea of removing hybrid support for 3. Couldn't we do the "stable" switch (removing that it's experimental from docs) and hybrid deprecations in the next 2.10 as well? I know we typically do those in minors, but earlier the better probably at this stage.