While this is true you cannot admit with a straight face that increasing the length of time and difficultly of the leveling process will not greatly diminish the sheer number of bad players. No one, no matter how inept at a game they may be, will learn NOTHING from leveling a job 4 hours a day for a month straight. Not to mention WHY would they? If you get stuck in the low 30's high 20's because you keep getting tossed from parties because you literally cannot function in the role you've chosen guess what? You stop playing it. Only a handful of stubborn time rich die hards would ever cap.
Am I saying everyone who reach 75 in FXI was proficient at their job? Several Nyzule Isle runs prove otherwise in my personal experience. That was something I only encountered a dozen or so times in 4 years of daily play. Challenging and extending leveling tends to make better players, weed out those without the aptitude for the role, and grants those who do cap a sense of relevance. That they survived the process of going from newbie to master and are now ready for end game.