As someone with a negative reaction to this idea, I think your characterization is off base. Nor is it a problem of fairness—I don't care who yc accepts nor am I interested in participating in yc.

I have a negative reaction because although I agree with the principle of funding people in general, I'm skeptical of the idea of people who "want to be entrepreneurs" rather than people who become entrepreneurs to achieve something specific. (I've already made one comment to this effect that was downvoted to oblivion.)

It's not that ideas are worthwhile and are what you should get into yc. I am skeptical that a good founder wouldn't be able to come up with scads of potential ways they want to change the world.