The myth cap requires 8 amdapor runs, which takes me about 300 minutes (5 hours) per week.
If it were a per-job cap, and not per character, then someone who wants to cap two jobs for instance would take about 10 hours per week.

I don't see how it is impatient to want that, since that person would be working twice as much for her gear, so it makes perfect sense she could gear up two jobs. I don't see why I should deny others the will to play twice, thrice more than me, if that's what they want.

Why deny that it would be a nice change to have a per-job myth cap and Coil lockouts? How would it change anything for those who just want to gear one job, like me? Why should I deny that the only way to achieve that, currently, is to make a second character and ignore the armory system altogether?

Furthermore, you can't customise your main job, so once you're done leveling your sub-class (usually 34 or so), and your other complementary class (usually 26 or so), then there's absolutely no benefit whatsoever to do any more leveling on this character, regarding its main job's efficiency.

I don't get what's to defend here, since these are facts; I don't get what's to refuse either, since it would still require the exact same time to gear each job, just on the same character. I think it even fits pretty well the vision that's advertised with the game: one character to do everything. Currently, it's just not the case.