Show time signatures, tempo map and markers in the Midi editor (as all the rest of daws do).
Make tempo track, time signature track and marker and ruler into a big one ruler (as all the rest of daws do) or stuck in the top (so you can use split view to other purposes).
Better window management.
A more flexible routing for MIDI (so you can route a midi track to other midi tracks in order to change some parameters globally, like CC1).
Better management of Instrument Racks/Tracks (I don’t like the old input/output you have to do in the racks because you end up with 2x tracks you need and also in Instrument Tracks, if you have a MIDI track pointint to it and you disable that Ins Track, your MIDI track goes crazy). I think they need to work in this, as it’s like half baked.
“Half baked” is what I don’t like about how is going Cubase. They release a new cool and promising feature (like Instrument track, expression maps, etc) but they do not improve it in AGES. And the bugs you found when they released it are the same bugs you find 10 years later.
A good move for the users will be to have all this Half Baked things properly implemented once and for all. They’ve started with the Video Export, so I have faith.