Most of the actual walled stages are huge though, so it's not a big deal. Wall game is important so it's understandable that they have to emphasize it
Some are. Strategic Space's lower level is very big. The Fight Lab stage (which is the lower level of Tropical Rainforest) is also really large.
But the top level of Dusk After the Rain and the starting area of Festive Parade are teeny (and even the bottom level of Dusk After the Rain is only medium-sized; talking roughly Hon-Maru in square area). As long as we don't end up with another Mystic Forest/Fallen Colony top level situation I guess we'll be okay.
If it can't run well on PC, then it wasn't worth playing. I'm just saying what I know you're thinking.