As far as some of the extra event modes like break the targets, if they are going to keep being terrible like after Melee, I don't really want them back.
Classic mode is definitely the best we got so far, if for the next games we get smaller rosters, I would like them to focus on making more boss fights, maybe one or two per franchise if possible, because this has a lot of potential, specially for some odd omission given models of the likes of Metal Face and Black Knight being already there to use.
And personally, World of Light is everything I wanted it to be, I loved every second of it, I have no complains, all the special maps, the nods and references, the spirits and their fights, the final battle, I just enjoyed it so much.
And I'm quite fine with the spirits, I'm 100% sure if we still had trophies, Sagi, Milly, Style Savvy and the like would be left without one, so I'm cool with jpegs since it means it can tap on a ton more gaming history and the more obscure games. I was so happy when I saw Circle of the Moon spirits for Castlevania.
So in general, it may not have as many modes, but is pretty much the most consistent fun I had with Smash Bros. so that is better in my eyes.