I just watched the question
turn around from being fundamentally ill-posed, under-researched and essentially unanswerable in its initial formulation, to successfully going through the full close → fix → reopen cycle and getting a suitable answer, through suitable input in the comments and an OP that was willing to listen to the problems and fix them as they were pointed out.
This stands in contrast to a fairly common view that closed questions are unfixable and doomed to obscurity, deletion, and censorship. While it's true that some questions are just too far off the grid to be fixed, for a large majority of questions this is not the case: the purpose of closing questions is so that their problems can be fixed, instead of wasting answerer time on flawed formulations. Very often, the reason questions stay closed is that their askers abandon them, are unwilling or unable to understand the problems that make them a bad fit for this site and its format, or are unwilling to put in the work to fix them.
As such, I thought it would be nice to have a gallery of examples where this process does work out as it's meant to, as a reference for when other questions run into more troubled waters. Here's one - please add more in answers as and when you run across them.
To satisfy the nitpickers: this post uses "closed" and "on hold" interchangeably; they are essentially equivalent in this context.