Job changes you'd like to see in Endwalker?

[Shurrikhan]

the problem is it already did and all the players cared about was the balance card.

Because they failed to remotely balance it and all but two forms of that "utility" were just different, worse shades of damage contribution.

If there is literally no way for a card which usually does 60% the contribution of another to do more than 105% the other's, even under perfect play, why would anyone care about it?

That's a balance issue, not a fundamental design one.

Take Warriors gap closer off that meter.

So that it can be pigeonholed into damage-dealing, rather than functioning as a gap closer?

If it had two charges, Onslaught would be the best gap closer by miles; as is, it's still arguably the best.

"Free" oGCD potency isn't free; it factors into the ppm of the job as a whole and therefore always comes at cost to elsewhere in the kit. A job as a whole may be overtuned over a period a time, but it's not going to be because their gap closers had more potency or less resource cost attached to them. Design for the gameplay you want; the numbers assigned to a particular skill will be ultimately irrelevant except insofar as they influence said gameplay (e.g., through breakpoints by which they change what, optimally, should be prioritized in a given situation).