The launch of Street Fighter V was troubled, with online functions and modes not working right. But we now know a reason for this; one man worked on the online coding until the games launch, with it migrating over to mobile Korean developer, Proudnet, after launch. Proof of this can be found on Linkedin.
This explains the issues during the games launch. The game is in a more stable state now, but this information is very interesting, implying that Capcom put priorities in the games development in different areas.