It's nice to see these old classic maps return, and the new battle maps are fun! (i still play the Chao Ruins video every now and then that round was crazy to watch)
With the Race Tracks however, they are awfully small, and being direct ports creates some issue of scaling, Bananas especially suffers from being a lot smaller than it used to be, leading to trick panels launching way too high for a real move to be played with them, along with there not being a lot of play space.
While it's rude to go "why didn't you do this instead", especially when said option wasn't available till well after you finished the basic ports. Bananas might benefit from the new Moon Panels. As their springs in Kart v1 were very much designed to work with air control.