When they announced this job before Heavensward, I had in mind a concept that was totally different.
I wanted to have a mobile range dps and fun to play. The problem is maybe that I conveyed the gameplay I could imagine from a gunner to a machinist (with riffle).
But even with a riffle, I know we can have something near a gunner, or something more enjoyable.
They should maybe get some inspiration from King or Cater from FF Type-0 (even it's not the same type of gun).

I don't know, right know MCH feel too stoic, too restricted, not very fun.
This is not the expectations I could have to control a character with a gun.

If they want, on the contrary, be conformed to the idea of Machinist, then, they should do something else on the side.
The turret(s) should deserved more carefulness, and should be extended (with the adding of several skills related to it).
I would like to see, for example, the flying laser turrets from Alexander be a part of the kit of MCH.
I would like to see the using of other machines, like calling a Magiteck Armor as reinforcement, etc.

So either, MCH stay as now (little presence of machines) but with a good refund of riffle gameplay, either they rework the job to give him half skills related to riffle, the other half related to machines.