Sometimes this is due to the woman in question not recognizing how subtle she’s being, and losing out on a date with a man she’s still interested in.
I would guess that this is approximately 100% of the time in practice, excluding cases where the man doesn’t pick up on the cues but happens to ask her out anyway. Approximately nobody accurately picks up on womens’ subtle cues, including other women (at least that would be my strong guess, and is very cruxy for me here). If the woman just wants a guy who will ask her out, that’s still a perfectly fine utility function, but the cues serve approximately-zero role outside of the woman’s own imagination.
If the typical case was actually to send very clear unambiguous cues which most men (or at least most hot men) actually reliably can pick up on, then I would not call the strategy “completely fucking idiotic”; sending signals which the intended recipient can actually reliably pick up on is a totally reasonable and sensible strategy.
(Of course there’s an obvious alternative hypothesis: most men do pick up on such cues, and I’m overindexing on myself or my friends or something. I am certainly tracking that hypothesis, I am well aware that my brain is not a good model of other humans’ brains, but man it sure sounds like “not noticing womens’ subtle cues” is the near-universal experience, even among other women when people actually try to test that.)
Based on personal experience, the strategy fails to even achieve that goal.
And fun though it is to exchange clever quips, I would much rather have actual answers to useful questions, such as “just how often does anyone at all correctly pick up on the intended subtle signals?”.