What I wish they had added is the option for a random Grand Prix.
I find it really fun when a new DLC Grand Prix is incomplete and they fill the slots with random tracks.
There should be a custom Grand Prix option with the tracks of your choice, or one that makes everything random, just like the custom match, but this time for the Grand Prix.
a quality of life change i hope they do in the year 2 update is add the main tracks as one of the choices for the crossworld instead of having to go with random. they have track textures and announcer callouts for them, but you never see them at all