Fashion do not need to make sense. Sensible folks (the minority part of family) may choose to ignore fashion; but if you are criticizing fashion (with seriousness), then you are in the wrong game.
There's both this type of fashion: https://s-media-cache-ak0.pinimg.com/236x/c0/66/12/c06612029...
...and this type of fashion: http://img.izismile.com/img/img7/20140521/640/fashion_runway...
out there.
Things can be fashionable, yet crisp and usable. Things can also be crazy, stupid (to most), and groundbreaking (to a few). Put another way, fashion currently dominates, but that would be okay since we don't need to sacrifice good visual design in the name of performance any more.
Unfortunately:
* People get lazy. * People don't user test. * People like to follow trends. * Designers and developers get micromanaged.
...along with all of the other monkey wrenches that most developers and designers have gotten used to. People end up building cool-looking websites that aren't as usable as they should be.