I haven't read all of this thread but can I just quickly say that the claim that CS staff don't like it when anything negative is posted and will lock such threads is false
While I can see why users are getting that impression, it's very false because staff do allow constructive criticism threads about various aspects of CS
What's not allowed on CS are rants. Having been here since the Things That Annoy You and Trade Rant Threads were started, I watched them evolve into horrible, ugly, nasty harbors of negativity, to the point where it was almost certainly the case that people were just looking for things to rant about so that they could post in those threads. (The worst of those messes have now been cleaned up, which means regular users cannot see them anymore. I watched as some of those messes were cleaned up and as posts were removed from public view.) I watched as those threads became worse and worse even as their rules got stricter (e.g. replies to other posts were no longer allowed after a certain point) and even as they went under staff ownership and, in some cases, admin ownership. The TTAY and TRT threads were given countless second chances over several years and users still couldn't stop using them as harbors of negativity, whether deliberately or unintentionally. The TRT was particularly worrisome as every post, by definition, involved some other CS user. But the TTAY was awful too.
So rant threads are no longer allowed. This is a user's view of the rationale that is now given when rant threads are locked: "Sorry, rant threads are not allowed on CS as they become harbors of negativity." Since I have never been a mod nor was I on either of those threads literally 24/7, I did not see everything, but based on what I did see, I'm certain all staff members who had to deal with those two threads had to deal with some horrible things.
But just because rant threads are no longer allowed doesn't mean that all negativity--or anything like it--is no longer allowed. The statement that no negativity is allowed on CS is false.
Whatever my thoughts about CS are, the fact that we don't allow rant threads is not a negative point for me. It's really a pity that years of horrible experiences can't really be effectively conveyed in like 1-2 sentences.
(Note that the Comfort Corner is still open. Despite the upsetting circumstances people are in and that they post about, the CC is, quite frankly, a far more wholesome version of the TTAY.)