And on the other hand, there are all my hairdressers over the years who asked me what I wanted and then did whatever it was that wasn't like anything I wanted.

So, flipping the allegory now, if a client comes to me and asks me to develop a Twitter, would it be OK if I deliver an eBay instead?

My conclusion is that it's probably time to treat our hairdressers like they're developers and instead of just saying "yeah, that's perfect" when we really hate the cut, tell them that we are not happy with the results and that we will be back once the hair grows for another iteration, and that we'll pay once we can go live with the haircut as we specified it.

Either that, or stop using irrelevant allegories.