I've never been a fan of the 3D update but IMO the post 3D update was largely successful except for a few things. These things are what I suggest be looked at before the next update.
They should take priority and a patch should be implemented before another update is rolled over them.
1. Post 3D 'batch' quali bug on certain tracks like Japan and recently Baku and others.
2. Pit exit lap time/track position gain on tracks like USA (post recent update) and others. This was so bad a car in podium position almost ended with no points. You can visibly see the cars jump/leap forward.
3. Return of dirty air: As much as I love the overtakes possible now, I feel it needs to be toned down to make now forgotten strategies (like breaking away early) possible again as well as to reduce the train fest we currently have which in turn will then bring in tyre performance into play as intended.
This can be applied selectively to tracks with very powerful drs effect maybe?
4. Game stability: This in particular has been a problem since the last update, especially on iPad devices. It's beyond frustrating having to delete and reinstall the game everytime you want to play.
Cheers lads and keep up the good work ?.