Edit - Too many people couldn't read the whole thing, orthe bold, italicized, underlined summaries, so I'm remaking this from the ground up and using less negative words or in less negative ways.
Wheeling thurst - This is a twin positional move to lvl 56 Fang and Claw that adds in a degree of randomization to the skill. When you do a combo, you randomly proc one or the other, which requires to use the right skill at the right location to get full damage (100 potency vs 290).
Problem - At level 58, Dragoons received Wheeling Thrust. This move only adds difficulty to lvl 56 skill, Fang and Claw, making it feel like you aren't getting rewarded at 58, but punished.
Solution - Stack Wheeling Thrust with Fang and Claw as a reward for lvl 56. It is the counter balance to add in more skill needed for Fang and Claw, and being twin moves, do not need to be separate job rewards.
As you can see, as it stands, it feels like you aren't being reward for all your hard work in getting to 58, but punished. Together, as a whole, Fang and Claw and Wheeling Thrust feels incredibly fun and do a good deal of extra DPS in a combo. Separated, receiving Wheeling Thrust as it's own level reward adds a tiny bit of difficulty and makes us feel like we were cheated out of the reward and instead given something negative.
Having the two together, as opposed to one removes the ability to plan ahead and causes a loss of DPS as opposed to JUST having Fang and Claw. This means we're going down in potential DPS when we hit 58 and do the job quest. A downgrade is a terrible reward to have, even if it makes the class more fun, knowing that fun is reducing effectiveness leaves a sour taste in your mouth. So the skills need either be combined into the same job reward or given separate useful effects to make it worth while having to randomly go beside or behind a massive boss.