I often think that there exists a clear analogy between electronic music and video games. The computer games of the 80s and early 90s possessed a simplicity and level of fun - often characterised as playability - which was to a certain extent lost when the exponentially-increasing power of hardware in the late 90s led to programmers to concentrate on all encompassing 3D effects at the expense of simple fun.
Likewise, I feel that many musicians today get too caught up in the neverending technical possibilities offered by their software (and digital hardware) at the expense of good, simple music which hits a spot close to the heart.
All the gear, but no idea - to coin a phrase.
I'm not sure what you'd call the musical equivalent of playability, but I think more musicians should bear it in mind. :)