>>717783104
>Donkey Kong Bananza recycles the assets from New Donk City, which the developers edited to look more modern
Because the previous game's NDC used a big band aesthetic that wouldn't be appropriate for the big city look bananza aimed for, but nevertheless, was the former was set in the current day

>>717312139
Donkey Kong Bananza takes place in the future, after "+" streaming services were invented in the Mario universe.
Super Mario Odyssey takes place during the early-mid 2010s, since laptops do exist.

>>717198657
Why her granddaughter and not just her daughter?
Yes, Donkey Kong Bananza takes place far into the future, but not that far.