I've tried to start multiple projects with non-developers, and NONE of them were willing to put in any work whatsoever.

Obviously, I might have been choosing the wrong people, but they seemed fairly accomplished.

I think people don't realize how much building software is boring drudgery (figuring out where to put a button). Maybe they expect it to be immediate wheeling and dealing.

Non-technical cofounders need to start out as project managers, and most people don't seem willing to do it.