Honestly the fact that you don't have many complaints after less than five years is a good sign, but tell us again in 10 or 15 years how well your online SSBU games are going.
I'd actually be okay with it if Nintendo just came out and said that online wasn't something they were interested in. I'm one of those people who is perfectly happy with physical media, single player, and local multiplayer.
It would have spared them a ton of trouble with things like the Nintendo Wi-Fi Connection Service, DRM, friend codes, eShop, Randnet, Nintendo Network, DLC, WiiConnect24, the wii shop, even Pokemon home/bank, etc. and they could have just kept on delivering gaming experiences that worked for players no matter what servers were offline, kept on working for decades as long as you had a disk/cart and the right console, you'd never have to worry about your purchases being pulled out from under you, and all of it could be lent/traded/resold/handed down freely.