Right now, FFXIV has encountered a serious design flaw in character progression. In order to avoid increasing button bloat (thank you), SE trimmed back a lot of skills and stretched the power curve for levelling.While this has honestly had good results at level 70, the process of actually getting there has become increasingly painful. Many jobs are simply crippled by the lack of certain abilities early on, which make their playstyles mind-numbingly simple - especially sub 50. Dark Knight is an egregious example of this: the class only becomes complete at 70, when you acquire The Blackest Night (arguably it gets much better at 68 as well). Machinist suffers from a dearth of skills while levelling, and has a particularly bad stretch from 40 - 50 where they basically get nothing. Summoners have a similar problem to Dark Knight, in that they fail to live up to their class fantasy until they have unlocked Demi-Bahamut.
These issues will only get worse with additional increases to level cap.
Within the current progression system, SE is forced to choose between button bloat and a decent levelling system. While I appreciate that FFXIV is it's own game and does a lot of things right, it can very much stand to learn a lesson from World of Warcraft in this particular instance. In WoW, characters learn all of their skills about midway through the levelling process. They then can refine their playstyle through selection of (for the most part) passive abilities which drastically alter how certain actions function. This lends a sense of progression and development to each class archetype, while avoiding the problem of overwhelming players with buttons to press.
Obviously this would require a major overhaul of every class, and is thus not viable for the Stormblood expansion. However, I strongly feel that a system comparable to this should be implemented in the next expansion, and that now is the time to make that point.