Name one or multiple features from past Mario Kart games that haven't returned since prior to MK8 that you would love to see brought back in MK9/MKX or whatever that new upcoming game is called:

I'll start with mine:

1. Speedometer (previously seen in N64, GBA, and GCN... and Wii too, albeit only available through Codes)
2. Display Finish Times for every single driver during their post-race scoreboard (previously seen in SNES, N64, GBA, GCN, and Wii)
3. Elimination Balloon Battle while also still taking place on Proper Battle Courses/Arenas (previously present from SNES until DS)
4. Give a majority (if not all) of Placement Counters or Position Displays a unique color-scheme just for fun (previously seen in GBA, GCN, and DS)
5. Display Top 12 Racers' Current Leaderboards During Races (previously seen in N64, GBA, GCN, DS, 3DS, and WiiU)
6. Quick Run mode, and before you ask: no, I don't consider Single-Player VS Mode the same as Quick Run mode, due to this particular mode allowing free one-course-races, and having a versatile scoreboard menu where your options include Retry, Change Characters, Change Track/Course, View Replay, and/or Quit, unlike Versus which behaves more as a very customizable & casual version of Grand Prix (previously exclusive to GBA only)
7. Customizable emblems would be cool too (previously exclusive to DS only)
8. Cinematic Award Ceremony Podium Cutscenes after finishing a Grand Prix (last seen in Wii, and to a lesser extent: 3DS as well)
9. Customizable Laps for each Course/Track in Quick Run and/or Versus Mode (previously present in GBA and GCN only, while DS and Wii required Codes for that)
10. And finally, my opinion's most meaningful forgotten feature out of them all, is to bring back Mission Mode, and make it either just as good, if not better than, as the only mission modes we've had thus-far (previously present in DS, and debatably in Wii too, albeit Online only)

I think that many features I listed would certainly be plenty enough not to matter if I forgot to list or mention any other forgotten features in Mario Kart that I nearly had in-mind.

What meaningful features that haven't ever appeared in Mario Kart since the 2000s are you hoping to see make a return in Mario Kart 9, Mario Kart X, or whatever will be their official title for Mario Kart's NS2 installment?

(P.S.: no particular set number/amount of examples per user are required in the replies, simply just mention as many that come to your mind easily enough, and that'll do more than plenty to count & matter)