MQA is an encoding format. I think, like many other people out there, you may have misunderstood what you’re hearing and why. What you’re saying is that you like what MQA have done in terms of modifying the audio files (which I wont call “masters” as their origin is doubtful).
For myself, when I tried the MQA versions of some very familiar albums, they had had a very strange EQ applied, or significant pitch changes (really?!?) or other issues that suggested that they had either modified the files or used different masters so that end-listeners would notice a significant difference and attribute it to the MQA file format, when it was no such thing. I do not want to listen to significantly doctored, lossy files. That is not what I paid for.
Now if MQA had released a bunch of new masters in a regular format and claimed that their mastering of the music was better, I can accept that. But not the subterfuge.
Roon does seem to have an issue with search, at least lately. Stuff isn’t showing up as it should, such as items in my library that I know are there and have added to and played before from playlists. Whether this is related I do not know. I know at least one of the principles of Roon is an MQA fan (see the Stereophile “MQA yes or no” video on Youtube) so I just hope that this isn’t a misguided effort to push people towards it.