EVE itself is arguably needlessly complex, but the PvE for the most part is pretty trivial.
It supports a wide array of playstyles, to the point market traders rarely undock.
I'm not sure it's a very good model for anything, since it is so niche, but I've just returned and it is in better shape than it was 5 years ago IMO.
Having to join a corporation is a myth spread by nullsec corporations, whose main goal seems to grab new players and turn them into F1 monkeys. And while I have multiple accounts, I've never multiboxed. It simplifies some content like fleet mining and ganking, but it's far from necessary.