"Skill" doesn't really apply to turn-based systems really.
Old JRPGs were never about skill, they were about strategy and planning. But, there was a fair amount of RNG if the numbers were close enough, and/or RNG involved in what attacks the enemies would use when.
But at the end of the day, if you had big enough numbers, you would win unless you made a mistake, or unless the game decided you were going to lose no matter what.
FFXIV crafting is no different than say, a boss battle in a turn-based JRPG, like oh, 7th Saga (an old SNES JRPG).
It's a bit simplified, sure, but it's still turn-based, allowing you to analyze the situation, decide what you want to do and when based upon your condition, their condition, etc. But it's still you take a turn, and it takes a turn (Normal/Good/Excellent pops) until you win, or lose. And at the end, you get a final % chance you get the HQ result.
People go on and on and on about 7th Saga being "Hard", to which I always laugh and point them to the series of videos I made where I take the worst character in the game, and go through solo (you usually have a party member to help you) and show that no, 7th Saga is not that hard. It's just knowing what to do when, and having high enough numbers to overcome the obstacles put in front of you.
.....and some luck.
EDIT: Consider these two short videos I made:
https://www.twitch.tv/videos/279210190
https://www.twitch.tv/videos/279734209
In the first, I lost. The second, I won.
Why?
I got a couple levelups (which is akin to getting better gear in FFXIV), and I had slightly better luck (more Good/Excellent procs), and in the first I made a dumb gamble, but to be honest even if I hadn't taken that gamble I probably still would have lost.