Anyone else find it kinda funny that the most world building we get in Mario games is from Mario Kart?

Even in Mario RPG games we only ever see a few small towns at most, we rarely see any franchises or multiple mentions of a business. The whole Mushroom world seems relatively small.

There's not really any world building in any of the 2D games, just Mario hopping through different themed worlds. Mario 64 just has you running around a weirdly designed Peach's castle jumping into worlds that only exist in painting and not anywhere else. Sunshine did have some world building with Isle Delfino, but even that was further developed with Coconut Mall, Delfino Square and Sunshine Airport. Galaxy you just jumped to different "galaxies" which were just a collection of small planetoids and platforms with a theme.

But in Mario Kart games, in particular the 3D ones we see a massive complex world. We see companies and franchises reference and advertised in multiple tracks and massive cities with massive amount of details put in them. Each course in Mario Kart 8 practically tells it's own story, the cities seem alive and well populated. There appears to be a thriving economy with multiple businesses and shops. There were some world building with the RPG games, but I felt like it was pretty minimum, the towns felt small and isolated from each other like it wasn't a connected world.

I can't be the only one who'd love an adventure platformer or RPG game set in the Mario Kart universe, right? And I know why Mario games are like they are, and I'm not complaining, I'm just saying it'd be pretty fun to explore the Mushroom world that Mario Kart, especially Mario Kart 8 has set up.