You don't get it. You can get coilovers that ride smoother than stock, on any car, the same as stock, stiffer than stock, etc. Same with springs. It really doesn't matter what you buy suspension wise, you can get it in so many configurations, saying any blanket statement such as coilovers made my ride rough, is just plain ignorant.
Example? See below.
:dumb::dumb::dumb::dumb::dumb::dumb::dumb:
:dumb:
Exactly