Consider adding optional job skills for Crystalline Conflict

Started playing again recently and enjoyed the return of role actions in Frontline. I particularly liked this because I felt it did return some player (and skill?) expression, and thought about how there isn't much player expression in ranked PvP as there are in other MMO games.

I thought to propose the idea of optional job skills that players could choose from to use in thier PvP kits. This would be unlike the role actions in Frontline, and closer to a specialization within the job itself. Summoner kind of has this already with the option to select between Bahamut or Phoenix limit break. But I propose to take it a step further.

What if you gave all jobs the option to select between two different limit breaks, or swap out 1 or 2 other abilities in their kit with something else entirely, similar to role actions? As an example, think of DRG being able to choose from having wyrmwind thrust or talon throw before queing up. The player could choose to have a high damage aoe line attack, or a more consistent lower damage single target attack. I'm sure better examples could be thought of to make for more interesting and expressive gameplay. But once you select your "specialization" you wont be able to change it mid-match. Mirror matches of the same jobs in ranked would still feel very different based on the players' specs and playstyles.

If there was no skill expression I don't know how to explain the gigantic gap between even diamond and the top of crystal (2k rating)?
Not saying that I want or don't want additional abilities though, but the observation puzzles me a little to say the least.

I'm fine with it, any excuse to have more buttons to press. Though we had additionals in previous iterations of the Feast along with traits you could choose from. No matter what, skill expression is only going to go so far as a meta develops almost immediately and if you aren't bringing those things, you're throwing.