I enjoy the Machinist as is and never really played it before this expansion. Adding anything that pins it to a position would take away what makes it great to me (Basically a structured Bard that has a rotation instead of a priority system). I just think there are far better things to worry about than trying to fix something that a lot of people are probably satisfied with.

The two Jobs that have the most issues in the game are probably Black Mage and Summoner. It has nothing to do with the End Game experience on them, because I think both are fairly good. Black Mage is just rough because what defines a caster is the casting timer, and it's the poster child of the entire caster lineup so it has some of the most outrageously big cast timers of any job. What makes those two problematic is that what they do changes a lot from low level to high level, making level sync a problem.

We can basically judge what is at the gold standard by what jobs are keeping the same rotation as they level up and just adding things to them. So stuff like Machinist actually is at gold standard. Dark Knight is another job at Gold Standard, and I believe the four jobs they introduced in the last two expansions are at gold standard. The ones that are problematic are ARR and HW. You can't really learn a job if the job doesn't even give you the right rotation until level 70 or 72. Paladin is kind of iffy on their rotation and I think they are definitely doing some tweaks to it come End Walker.