I wonder if we would do better by assembling a list of 10 or so example questions and then deciding if the problem is actually not closing the source of the "plague" - It's harder to balance the "not everything needs fixing/let's change everything" value judgement with the "we're open for anyone to participate" in single cases.
That question itself has some serious problems with either incomplete information or wrong information and has aged poorly.
- Which contact app is being used?
- How many contact sync options are engaged (you could sync over iTunes to Mac, iTunes to PC, cloud to a handful of custom or standard services).
- What version of iOS?
I would say - if you wanted to help out that problem - explaining why it needs to be closed in a comment or working up consensus here or in chat to get a few people to agree it's actively harming the site and/or see if it can be linked to a better canonical question.
All that being said - that question has likely helped a lot of people even with the tons of answers (that's a signal that the problem isn't a simple as it seems) and none have risen to the top indicating that the thread in question isn't a good resource for getting a problem documented or solved.