The more pertinent issue is that many TVs will only do VRR over HDMI 2.1, and many active DP to HDMI 2.1 adapters won't pass VRR through either.

That's also why the Switch 2 supports VRR on its internal display but not when connected to a TV - the dock can't encode a HDMI 2.1 signal. That's just Nintendo being Nintendo though, they could support it if they wanted to.