It would have, but it would have been much more expensive and time consuming to do.
The main thing about marionetting in 2D is that it's incredibly fast and easy to edit or add animations to anything. It's really good for iterating on gameplay concepts and going from pre-prod to final really quickly.
Yeah, I understand what you're saying. This game is essentially a return of an old classic, so Capcom are most likely testing the waters with a cost and time efficient budget title.