Is their a DPS job, thats perfect that way it is?

[Rilifane]

Some jobs have plenty of space for new buttons. My machinist bars feel practically empty compared to other jobs.

They don't all need to be exactly the same, but I feel they should be aiming for all the jobs to have a similar amount of buttons to press.

I'm not sure about it. The number of buttons itself doesn't mean anything. Just look at BLM... not a ton of buttons you regulary use but still fairly high complexity if you want to play it well. And I think it's better to have some classes with less buttons while others with more to give players more options.
Less buttons doesn't have to mean a lack of complexity but wether you want to push a ton of buttons less frequently or the same buttons more frequently is a matter of taste and players deserve to have that choice.
There are as many players who don't enjoy AST or GNB for the high amount of buttons as there are players who don't enjoy MCH for the lack of it. And it's good that different classes cater to different preferences.

[Jandor]

Less buttons doesn't have to mean a lack of complexity but wether you want to push a ton of buttons less frequently or the same buttons more frequently is a matter of taste and players deserve to have that choice.
There are as many players who don't enjoy AST or GNB for the high amount of buttons as there are players who don't enjoy MCH for the lack of it. And it's good that different classes cater to different preferences.

Is it the amount of buttons that puts them off, or is their relative complexity compared to their peers? As you say, buttons don't equal complexity.

I'd like to aim for about 30 per job, but I'm not going to be upset if they don't do that. My main issue is the whole "no more space" argument when some jobs have half a dozen less actions than their peers. I don't know where I'd even put new abilities on PLD, but jobs like MCH have plenty of room for new stuff and the idea that they shouldn't get anything because other jobs are a bit too bloated already is wrong IMHO.

tl;dr I want new stuff for MCH.