it's also being made by the Galaxy team.
i understand liking that, but SM3DW will have elements from all the games, from 64 to Sunshine to both Galaxies, along with stuff from SM3DL. It's a culmination of all those games, and a successor to all of them.
If that's not a new "true" 3D Mario, then I don't know what is. Perhaps y'all need to re-evaluate your personal definitions of that and take another look at this game.