Thanks for your reply.
I feel as if bringing back similar stages wouldn't be a "waste of a slot", as such stages would be simple to create (just slightly modifying existing stages), much like echo fighters, they wouldn't take up as much dev time as a full-fledged new stage.
As for Mute City and Rainbow Road playing just like Port Town Aero Dive, you could say the same thing for Mario Circuit from Wii U, but that's in.
I gave plausible ways of adding Jungle Hijinxs and Pac-Maze to the game without removing their central mechanics.
I think it's a shame that stages where you play to survive are being cut as they offer a playstyle unique to other stages and could be fun - they really fleshed out the "party game" edge of Smash IMO.
Agreed about Pictochat, I'm actually kinda baffled it's not back, I really don't understand why they cut it. Every other stage I listed has at least one possible explanation I can think of, but this one bemuses me.
Sakurai mentioned recently that the dev team's main goal was to reach 100 stages, so maybe they wanted to stick so rigidly to that total that when it came down to the wire, they had to pick between Pictochat 1 or 2 to add as the final stage. That's really the only thing I can think of... Even then, though, you'd think they'd just combine them and make Pictochat X.