I think one of the primary reasons that people's needs vary so much, vis-a-vis the PAS, is that some peoples' jobs tend to involve playing background (or low volume foreground) music over an entire venue, whilst others' needs are for a system that is LOUD and proud close to the stage, with as rapid a drop-off as possible from there on outwards. Obviously, the PAS is good for one need, but not for the other.

But, let's face it, if form factor were the ONLY consideration, who WOULDN'T want a PA that looked that cool?