What change do you want to see on your main class for Endwalker ?

[CKNovel]

The Machinist is showcasing two potential weaponskills (Clean Shot old animation and Shotgun.)

Definitely likes the idea of a shotgun. Clean shot old animation is a bit weird to see, maybe it was just for the purpose of not using a flashy skill.

It's way too early to know what the shotgun will do or what part it plays in the rotation, but all we know is that it's an AoE.
Maybe Spreadshot combo? At worst, Spread Shot trait (which will ironically make the MCH use less and less his gun). Or it could be an action that finally consumes heat and that is not Hypercharge.

Heat gauge is always tied to gunplay so it would make sense for the shotgun to be tied to it. Be it generating heat or consuming heat.

For now, wait and see. It would be cool if Yoshida could be interviewed about the jobs and the direction chosen. But for now, we have to wait for Job Action trailer which may happen earlier.
Please don't be just another AoE tool.