I updated to Big Sur 11.1. When I launched my Big Sur 11.01 guests to update them, two of them crashed and died and left me a zip file on my desktop. The third one zombied like the Catalinas I tried to enable 3D and left the very nice attached screen. I had loaded the 11.2 tools to see 3D in macOS. I was originally going to ask what Apple might have fixed in virtualization in Big Sur that would help the Fusion situation...
My 32-bit Windows 10 VM was slow to start but seemed otherwise OK once it was up. The 64-bit VM which has V-in-V enabled and the browser virtualization enabled seemed to do better.
So far not really so good for me...