Are you sure? GCDs for example aren't really any faster now even when players have skill/spell speeds in the thousands than they were way back in ARR.
You can go look at logs of like gordias savage for example and compare average crit rates from jobs to what the average crit rates were for midas, creator, delta, sigma, etc etc... and see they really don't change that much at all despite the stats getting higher and higher with every tier of gear..
Speed is the same thing. Why is it that if you get synced down to say 50 and lose over 1000 points of spell speed your flare cast or your fire 3 cast isn't really any slower?
Because the stat makes no real difference at all. It just keeps getting higher and higher and doesn't really do anything.
This is why they can't make stats transparent, because they have no consistent value or effect. If you make a comparison to FFXI as an earlier posted said it was exactly the same there. In as much that stats effects were hidden yes they were.
However the effects in FFXI were measurable and consistent. You could easily work out that the 15 dex stat on Byakkos Haidate would result in a 3.75% increase to your ninjas hit rate because stat effects were consistent 1 accuracy would always result in a 0.5% boost to your hit rate. 2 dex would always equate to 1 accuracy for a 1 handed weapon user. the same was true with pretty much every stat. although hidden the effects were measurable with a high degree of precision.
It just doesn't work in 14 because the stats don't have a consistent value. A few jobs have demonstrated it quite well over the course of the game since ARR.. Where magic numbers for skill or spell speed would allow you to squeeze that extra heavy shot into something like a raging strikes window. But then suddenly you can't do that anymore because now you don't have enough speed.... So you need to pile on even more speed stats just to do what you used to be able to do with less points in that same stat...