Honestly, them remaking all the stages from scratch didn't help matters. Us getting less wasn't that surprising. I'm not sure what the reason was for this decision, but anyway, I hope for more variety. There's other n64 stages never reused(and some like Meta Crystal don't even have a remake in the same way Corneria is for Sector Z as an excuse) too, so they'd be nice.
I'd have to loved to see all stages return, though. Just some should have their gimmicks reworked, and it's completely fine if they aren't compatible with Stage Morph. Notably, even some of the Final Destinations do overall play differently due to minor changes, but we already have that as a Mode/Option, so they're the only ones legitimately redundant to return previous versions of. Stuff like the N64 stages have minor differences, though I completely get why it's not enough to justify a return. That, and Sector Z, for instance, is rather big as a stage. We've had enough issues with Palutena's Temple(I would love to see this reworked, maybe as a transitioning stage so it won't be so massive? Like, it makes Temple look small. And that's hoo boy).