You shouldn't need to have to swap jobs from machinist. It has greater utility than every other dps job not named bard and its personal damage is so high that you really shouldn't ever need to swap from the job. If you are running into issues with how the job is performing for you and within your group, odds are those same issues will be present on any other job you bring in to raid. So best thing to do would be to look up some more info and practice things on your end. Then just work up communication within your group to help be efficient both as an individual player and as a group.