Nice summary. Thanks.
That leads me to a follow-on question about the UMC.
I was previously thinking that the UMC was an AC-to-DC converter because it seems to get fairly warm when in use. After reading the above, my guess is that it may not be. I'm curious about exactly what the UMC does. Seems like it provides an extension cord, physical adapter, and some handshake protocols via extra pins. Feels heavy, as if there is a big transformer inside. Is there any voltage conversion (ac-ac, ac-dc)?