are you asking that question rhetorically?None of the digitally-sourced MoFi 45RPM Ultradiscs that I ever listened to sounded good. They all sound flat, like elevator musak, no life at all.
You admit here that in a number of cases you didn’t like them. You say Fleetwood Mac Rumors “sucked”. Why don’t you just take a chance here and speculate as to why so many of these expensive state of the art MoFi releases suck?
likely i did not have my own quality reference pressing already of some of those to compare. but in other cases i did. hard to know the story for each one. and during some periods i might buy a few dozen records and not listen to them for months, or occasionally never.
i posted about how i felt about the Fleetwood Mac Rumours 45 very strongly a decade ago. i had been really looking forward to that one and was very disappointed. even bought a second 45 copy from an alternate pressing plant to see if it was better (it was not). i had a much loved original pressing of Rumours so i was looking for better then that.