Swapped the Prime X370 Pro with an ASRock Fatalwhatever Gaming K4. Generally better options, though not all fan headers can run in DC mode... only real downside I could find.
Did not resolve virtualization issue, so I will assume that we will just have to wait for the software ecosystem to catch up. Boot times, interestingly, decreased by about 5 seconds when using RAID (fast boot vs fast boot - most of the benefit occurring during Win 10 boot, so that could simply be a matter of Windows reorganizing its boot-time drivers).
Having full AMD extended options available, VRM temperature monitoring, and an extra M.2 slot makes it a pretty easy choice, IMHO... two of those things aren't even advertised, so you'd never know.