The reason was explained by staff in a post in your topic: because it was already discussed recently (at length--a 145-post topic).
Further:
They aren't; just the opposite, they have acknowldeged the feedback (e.g., in this post: Will the UI ever get better? - #4 by bobbyD). This is also far from the first time the UI has been discussed (the thread above is not the only place), and they have made small improvements every release for a while now with hints that there is more to come.
