Well, if they are all clogged up and overflowing, they are certainly no good, but which would you rather do- change out a filter sock every few days/week or vacuum out a pile of detritus in the bottom of your sump, which in most cases is in the bottom of your stand, very close to the floor? I'm sure you are aware that you either have to use a self priming pump or a gravity siphon, which you cannot make due to the location of the sump.
Also bear in mind that when you vacuum out your sump you vacuum out thousands of pods
and beneficial creatures which you want to make it back to the display.
Also, if a fish takes a dive downward, it's an easy catch in the sock- trying to net a fish in the skimmer or refugium compartment is not easy, or maybe it will get sucked into the skimmer pump before you find it.
I dunno. I think filter sock sounds easier.