I'm not saying it is wrong to use the same engine. The thing is every smash Bros episode are a leap in terms of graphics, content, characters. So there was obviously this kind of expectation for a smash Bros switch.
I'm just saying why this episode doesn't feel like a leap, why the game doesn't have the positive buzz it should have.
Personally, I think the series needs a complete overhaul, it's peaked with melee and since then each new episode have been disappointing.
Peaked in terms of quality, not sales. I was clearly talking about the content of the game.