As a heavy Tidal user I find this missing feature very annoying, Every time I like a song in Roon coming from a service like Tidal or Qobuz I wish It’d sync to these services as well. But no, I have to switch over to the Tidal app an manually search and like that track.
Alternatively as a killer feature: Open Roon ARC API to library sync services like soundiiz or tunemymusic.
As it is I’ll likely I end this month subscription after the current period but keep an eye on this request.