I disagree, the whole point of adding Jobs on the classes is to concentrate on different stats and bring in some unique abilities atop of the class you mix it with, and when SE takes out the Point System of Stats and have each class its own set of Stats. Based on the class customizing Jobs will help the player reach their goals. A GLA is not a Paladin since he can still do quite the damage on his own and when equipping a paladin you are sacrificing Att for Def. Also you might want to rank up GLA on its own just to keep the neutral stats.
I understand this is not what you are arguing, but I am a fan of DRK and I leveled CON and THM just to make my DoW classes into a DRK and I had a great deal of fun trying out the different types with ARC, MRD, LNC, PUG and GLA. I was greatly disappointed that even with the Stats I had which favored Mages my drain would do so little damage, plus I do not have the AoE that a THM or CON does (which I completely understand that we need a little restriction to create a balance). I even allocated my elemental stats to favor dark spells following Zam input for Spells attributes which I now am seeing doesnt really make a differents. So It makes sense having a DRK job to equip on any class to improve not only your STR and INT but take away your VIT and MND. The DRK would also improve on your dark elemental stats (or the elemental Stats that dark is based on).
Anyways I am just saying earning a job meaning I went through the quests, did what I did to earn it, or be it I had to skill up the weapon like in FF2 (japan version which is re-release all over the place) just to use it with other class I don't mine as long as I can customize my character and be different from other people. Having a whole bunch of GLA/DRK is not unique and sounds to much FFXI which I agree is a awesome game but I am playing FFXIV for its freedom and not the restrictions.
P.S. I understand everything is just a idea and concept you guys like so I am not trying to bash your thoughts in any way. In truth I believe your idea will bring out more challenge to the game then my own idea as my concept sounds more for soloing than team playing. So please forgive my thoughts on the subject.