I thought I was buying a finished product when I was buying Super SF4, and I'm realizing now that won't happen for a long time.
You did buy a finished product. I guess that's what I don't get.
Ignoring UItimate Marvel vs Capcom as that was due to poorly constructed contracts, there is a large period of time between these SF releases. Each individual release is the full game.
If you're uninterested in playing other people and don't care about the additional character, the prior version is a 100% complete game. The only thing stopping you from realizing this is you.