Skillspeed isn't worthless, it's mandatory.
The problem is that the best skillspeed depends from one player to another.

There are some jobs that absolutely wants lower GCD, BLM I believe.
There are some jobs that just wants a set SKS like SAM, NIN, MNK, GNB...
There are some jobs that wants 0 SKS, I believe the whole ranged role doesn't want SKS, DRG and RPR, DRK doesn't need SKS.

IMO, the player should have easier control over the SKS/SPS.
For example, bring back stats points and let us spend those in SKS/SPS, CRIT, DH and DET + Remove all SKS from gear.

SKS can be random while you're working on your BiS, having your SKS always set to your prefered SKS would be amazing.