Yep, that's the point, get it all in one sub.
Not all complaints come about as a result of "bitching". Sometimes people complain if something has gone wrong, or appears to have broken, or simply doesn't work on what was an expensive - and brand new - device.
If I am looking for advice on a new device - and I used to read the MBA section of the forums avidly on this forum in the days when the MBA was a new and exciting computer - I expect to be able to read accounts of ownership that are both positive and negative.
Reading posts about computers, devices and phones that are solely positive are missing the point, and run the risk of coming across as though they are advertising for the company in question; I can already read that if I consult a company's website.
On a forum such as this, I want to read authentic and accurate feedback, - reviews that are both positive and negative - as that will inform my own responses, and may have an influence on whether I choose to buy that product eventually.
Moreover, leaving whatever 'complaints' (or problems) have been posted in the sections dedicated to the respective product or device (rather than in an echo chamber, or ghetto devoted to 'complaints') one may receive advice on how to deal with a problem or complaint, which one will most likely never receive (as many posters may never visit it) in a ghetto or attic marked "complaints".
Therefore, to put all of the 'complaints' into a ghetto marked 'complaints' runs the risk of leaving the remainder of the forum unnaturally positive, creates an unusually negative feedback echo chamber in the putative complaints section, and would, possibly ensure that while complaints were vented , much of the rest of the forum might not be made a aware of issues of quality or concern that may have arisen as these are no longer part of much of the mainstream of the forum.