I loaded Unity Hub and only get a white screen. Same thing for the Epic Games loader. I was able to circumvent installing Unity without it but the same thing -- a blank screen. With Apple's demo at WWDC with Autodesk Maya, I was truly hoping for better emulation (even if it is slower) so that I can start testing in Unreal Engine and Unity. It seems this is going to be a long way off, and probably could have save myself $500 in developer fees until 2021.
In saying that I was happy to see that Reality Composer works in the Xcode beta, and was able to port my COVID-19 virus model into it with no problem. Also downloading the beta version of Reality Converter works as well.
Note: I have looked for a check box in the info box for Rosetta, but many of these show up as "Kind: Application (Intel)" with no check box. Am I missing something?