skill-/spellspeed, why is it still here?

[Lemon8or]

With GCD < 2 sec you can get one more in, I know its not huge difference but I just enjoy attacking faster, it makes combat more exciting.

And how much SS is needed to do that? You're sacrificing so much Determination and Critical to achieve that high of a number just so you'd run into TP starvation later on. And when you're TP-starved, you have to wait before you can attack again. Isn't that less exciting?
Here's an analogy: Do you want to hit fast but hit like a wet noodle for 5 minutes or hit hard, just a little bit less fast for 8 minutes?

Take the Twintania fight (seeing that most people can access it and can relate), within the first few minutes of the fight (up to the first or second conflag) if you don't get put into a conflag to stop/slow your DPS 400+ skill speed will, generally, put you to 0 TP.

Even at base skillspeed, I was running in the neighborhood of 300-400 TP by the time divebomb starts.

Spellspeed and skillspeed are two stats that only gets better the more you put into it. 1 Determination is just as good DPS buff no matter how much you put in while 1 Crit gets worse the more you put into it while 1 Sspeed becomes better the more you put into it.

Spellspeed is good for BLM because you have unlimited MP as resource. Skillspeed is useless because we all have the same TP regen no matter the skillspeed. Determination increases average damage. Crit increases critical hit rate per point so there's no diminishing returns there. Skillspeed increases attack speed but does not increase TP regen so you're running out of TP way earlier than you normally would.