In the words of Unify’s developer:
”I see no reason for Unify ever to stop hosting VST2 plug-ins, and I would imagine that DAW vendors other than Steinberg probably feel the same way. If, some fine day, every DAW in the world stops supporting VST2, we might stop shipping Unify itself as a VST2 plug-in, but the VST3 version would (as I've written elsewhere) become quite valuable as a bridge to allow loading older VST2's.”
https://forums.pluginguru.com/questions-about-unify-v1-0/will-unify-ever-run-natively-on-apple-silicon/