FWIW, I am much less likely to procrastinate on an update if I know it fixes a vulnerability.
And wouldn't a vulnerability still be there even if there wasn't e.g. a PoC disclosed? I'm not really sure how that affects what I'm saying.
Of course not, that's a straw man that only you are suggesting and often isn't even possible on most systems. People by-and-large will apply all pending updates at once.
Responsible disclosure pushes folks to update. Well, that and new emojis that they're feeling FOMO from. It's a carrot and stick sort of operation.