First of all. I am no genuine theorycrafter or such. I don't have the maths and tests to provide you about my statement. All I have is the experience I play with the game.
Skill Speed.
Most of us think the Skill Speed is designed to make our swings faster but it only provides very little speed. Thinking that the faster we swing, the more DPS we provide. But you need more than a lot of swings to make that happen even if you have 2.39 GCD of swings. Most likely, we run out of TP.
My opinion to Skill Speed is, reaction to certain mechanic. It provides very little second allotment to react to stun(Shield Bash) or mitigate(Inner Beast)
I noticed that monsters also have GCD too. Same with us, with that said, giving a very little second to react is huge, especially on clutch moments.
For example, you want to use Inner Beast before Nael cast Ravensbeak. You have good skill speed to execute your mitigation. Which is good.
What are your thoughts?