That is, I'm sorry to say, not at all true, at least not universally the way you present. Any player I would want in my games is going to commit a fair amount more time than that. Because they're going to think about their character outside of actual session time. They're going to care about the world, and (ideally) creatively invest in that world, providing me rich fodder for new scenes.
I talk with my players regularly outside of session. Seeking feedback, material, just generally enjoying time with my players. Being part of a TTRPG is a social experience, which...I mean that has always meant for me that I dig deeper into it even when I'm not (metaphorically) sitting at the table slinging dice.