In fact, as far as I remember some statements here in the forum, you are actually encouraged to contact support about this. They even stated somewhere (edit: according to this post it was the Software issue report) that they want to hear the bugs people are struggling with to get an impression about frequency of occurrence.
However, I also always thought that this is not the best way to handle this due to the same reasons you have mentioned (support getting spammed with this) and that it would be far better to set up a site or some kind of communication means which is more effective for all parties of the story.
Of course, there are the categories. But at least, this is not as obvious to people as a special communication means for that could be and I nevertheless don’t really understand why support wants to get spammed with bug reports.