Wigglerman
Smash Ace
Well that's because SPC in other fighting games has been garbage for years so people just don't expect it. But games like Tekken, especially Tekken 3 and 4 had robust modes that were SP or MP. People still pine for something like Sub Space and a lot of side stuff Smash had like Race to The Finish, Board The Platforms and that sort of thing. Havingmore bits and bobs is always nice and some people REALLY love those modes. I know I was a lover of the Platform mode in Smash 64 and played it A LOT back in the day and even a substantial amount in recent years when I decide to boot up the N64.I mean, they already did that. We got a ton of changes to versus that make it both flashier and faster. Online could be better for sure, but outside of balance patches, the game's in a very good spot for just 'playing' it right now.
I feel like people severely oversell the importance of single-player content in fighting games here. You rarely see other FGCs talk about their single player content for a reason.
Smash can, has and does lend itself to more single player content simply due to it being Nintendo characters (primarily) and being a platform fighter as opposed to a conventional 2D/2.5D/3D fighter where single player modes are far less...interesting and serve to be more gimmicky than fleshed out and fun things to do (Outside Tekken Force. I LOVE Tekken Force in Tekken 3+4). The usual 'Arcade/Survival' modes seem to be the extent of most conventional fighting games.
And for people who don't have good online, don't have a lot of people local, they rely on single player content to enjoy fighting games of any kind. There are even people who like to play fighting games but only against AI, not against other people. So having SOME single player stuff should be there. Just wish devs would be more creative.