First welcome cubase 12 great update.
and of course like every update there are also features that not included,each user has its own workflow and wishes. i have many but my top 5 for next update are.
1: Gapless audio
2: option for VST+VSTI plugins following track selection and tabed container for all inserts on the plugin window(like S1 or wavelab)
3: new gain envelope automation on audio events like any other automation (maybe midi too ?) that also works on multiple selected events
4: at least Volume and pan control on track header on project window
5: add range selection tool to key and drum editor
6: (a bonus FR i give to myself )) option with key modifier to choose multiplied ranges with range tool (S1 style)