But we could've had Mario & Sonic Kart, or Mario & Sonic Party!
All Olympic games series were developed by SEGA while Nintendo already have a team of their own to develop Kart and Party games.
Nintendo would say no if SEGA ever pitched tjose ideas to Nintendo.

SEGA needs an idea that's never been done before in Nintendo if they're gonna have Sonic x Mario crossover.
Just like Ubisoft could succeed in pitvhing X-Com-like game ide for Rabbids x Mario crossover.
What a subpar way to introduce a new character to the lore, that is, if she'll ever get any major appearances in the future.
Probably her next appearance would be in Tailstube again.
Among Us is DEEEEEEEEAD!
It's still on top of the Nintendo's eShop games chart.

I thought Sonic 4 was scrubbed in favour of Sonic Mania?
I guess now SEGA didn't want to srub it since the game's still loved by mobile games fans (but not console gamers).
And does the entirety of IDW Sonic comic take place before Team Sonic Racing?
There's Team Sonic Racing comic published by IDW but it doesn't show where its timeline is ...