I suggested this exact same thing lol
though if they don't decide to release the old maps as a 'custom' map pack sorta thing, i think they should reintroduce them in at least some manner
like, maybe they could completely rehaul them, but keep certain landmarks and the same overall land structure, but maybe add in more vegetation, dens, and etc
like, they could rehaul Fluorite and reintroduce it, with new vegetation, dens, and just generally make it look a lot better and less empty, but keep some landmarks similar to how they used to be, such as the N/Z, Stone Bridge, L Island, and etc
I mean, they rehauled Ficho, Lonely Cave, and Bonfire, it'd be a nice idea to rehaul the others too.