Asking for restrictions to be lifted and complaining about the ones that are in place are two entirely different things. And Yoshi's comments pertained to releasing sets of gear for classes that currently have restrictions. I should not have to mention that once they are in place, they are troublesome to remove. It is much easier to release sets of gear that mimic them and made available for other jobs and roles, which they have done. This does not prohibit them in any way for releasing new sets of gear that are entirely new to the game and place restrictions on them, which we all should be used to by now.
Restrictions, despite contrary belief, don't hinder options and diversity in the game. I should ask if all the roles in the game are wearing a set intended for casters/tanks/healers, how is this not homogenization? Sure, if restrictions are not in place it gives the player more options to glamour, but this does not necessarily mean it is going to eliminate homogenization among the playerbase. This is done through diversity, and sometimes the devs have to force it, especially with new sets of gear that will undoubtedly be trendy and a novelty upon their implementation.
Restrictions by nature are preventative, so they are in place to keep player acquisition in check. They also exist to provide incentive. Weekly loot lockouts and capped tomes are examples of said restrictions, and prevent players from getting BiS in a matter of days or even hours. As a result the content stays relevant until better gear is released, which gives new players the same opportunity to clear the content as those before them.
In the case of glamour, the restrictions provide incentive to play those roles and the jobs within them. Not wanting to play a certain job in order to obtain it is a moot argument made by the other poster because SE still needs those roles and jobs queueing into the content so they at least attempt to get a balance among all the jobs they've released into the game.
Lastly, it is simply ok for some things to be restricted. Certainly more ok than it would be for restrictions to be eliminated entirely, which hopefully I enlightened to how it can be harmful to the game. You don't give an inch to the "I want my cake and eat it too" peeps, as they will take a mile. Restrictions doesn't have to be demonized like they are here.