Is "finding the right players" a solvable problem, or just luck?

[prabe]

IMX, in asynchronous prep people will talk about things and bounce ideas around. But my players have a habit of never actually making any real decisions until we actually meet up (virtually) for the real session 0. It's only when they're in front of the group that they will truly commit to a class or a concept or a preference.

I don't doubt that at all. Different people will have different experiences. For instance, I've had players use the Discord chat for one campaign to plan their characters for the next, and much of how those characters connected to each other. They had their character concepts in place by the time I had my starting-point setting work done, as well as a lot of their connections.