I am a scholar main however I loved the idea of a "machinist" as far back as when I played the original final fantasy tactics game. I adored it. I am sitting at level 59 with it and going to reach 60 in a few days/if not sooner.
I am staggeringly disappointed that the machinist is not viable (I can argue the fact that the skills are... not what we were lead to believe through the description but viability is obviously the #1 concern).
HOWEVER I am confident that the development team released these classes (AST, DRK, MCH) all undertuned intentionally so that they avoid the ninja "crisis" where they had to outright nerf hard many aspects of their kit. So INSTEAD they release it knowingly undertuned and then buff multiple aspects of the kit.
Furthermore no developer that cares (And believe me the FF14 development team obviously cares a lot about it's players) would shrug their shoulders and let a class of theirs die.
Stay strong and just enjoy whatever you can at present, do not let anyone take away your fun! Stay positive- we are all confident that buffs are along the way!