Here are some items that could be interesting for a variety of users.
I've been using tidal for a few weeks now and some crucial meta data about songs aren't getting to rekordbox :
1- song's year, genre etc. Not too sure what is available from tidal but it seems more limited in Rekordbox than what you can see in Tidal's app.
2-Ability to not "squish" the waveform when using 4 decks horizontal...
3-Choose what alignment for the waveform. Currently only the center alignment is available but the "left" alignment like on the CDJ3000 would be interesting.
4-Allow the metadata of music playing in performance mode to be accessed via OBS; since a lot of people are now stremaing live sets it is a bit tricky to get it done via non supported 3rd party solutions (github's various projects to access the "history" folder of the current session)
5- Tidal's implementation with Kuvo; nothing comes out at the moment for streamed songs.
Hope some of these are helpful to others and make their way into a future update.