One dynamic that I feel the game needs to improve on would be the ability to have multiple classes be able to equip different weapons. Right now classes are tied to the weapons they equip. Sword/dagger - Gladiator, Great axe - Marauder, etc.
Currently right now the game lacks the ability to specifically level up weapons skill levels. When you fight something as Gladiator the log says you earn 'x' amount of sword skill points, but it doesn't level your sword at all in fact the skill points go towards leveling your Gladiator. In FFXI they had not only Job Level but they also had weapons skill level/evasion/guard etc. Each job was able to use an array of weapons with varying degrees of skill levels. This means that although multiple jobs can equip this type of weapon theres classes that may be better or worse depending on what their rank with the weapon is (A+ A A-, B+ B B-, etc.)
Since over 75% of FFXIV players votes to remove physical level I feel that by adding this to FFXIV it would add more of a character progression feel. This would allow multiple classes to use different weapons and freedom to choose to switch things around. For example a Lv 50 Marauder can equip sword and has a B- ranking (skill level 230) which means it would have decent attack and accuracy but a Lv 50 Gladiator has an A+ ranking (skill level 275) meaning he'd be slightly better suited to use a sword but the Marauder would be able to switch it up as he sees fit. Just like in FFXI weapons skill levels would have a chance of being increased by making successful hits on mobs that are Even Match difficulty or above. Skills would subtly be increased like +0.2, +0.4, etc. depending on the mob difficulty.
I think SE would be able to easily add a class change section in the main menu to allow users to select what class they want to change to rather than what weapon is equipped. Not to say that every job can use any weapon cuz that shouldn't be the case either.
Sorry for the rant. Let me know what you guys think.