People keep preaching the problems, but offer a worse solution. Should try not looking back at FFXI's outdated mechanics that would hurt the game more and think how you can improve on systems currently in place. Then again, majority of people complaining in here are once FFXI players and don't remember actually how much not fun a lot of the events and grinding was. I'm going to get flak just for pulling the rose tinted glasses card out.
People say that horizontal progression is better. I would argue that it helps nothing. The same BiS sets are going to exist, 95% of the gear end game will be irrelevant because the 5% of it will be the BiS and groups will require you to have it before joining their group. It happened in FFXI, don't pretend it didn't. Funny how many DPS I saw not get invited because they used a regular Haubergeon and not a +1, or no O.Kote. While vertical progression may have flaws in it's own right, it at least give a sense of empowerment and the feeling that your character is growing per piece you put on you. How good does it feel to do that 100 more damage to a mob after getting a better weapon? It feels very good.
People say that SE needs to break the mold on MMO mechanics. It has in many ways without shaking up the formula, and sometimes that is all that is needed. Shouldn't put the Final Fantasy series on a pedestal of originality in mechanics. The first one alone used blue prints from Dragon Quest to create it's game, and became it's own franchise in the process. It used a formula everyone was familiar with and added it's own thing to it with a great story, jobs, solid mechanics. FFXI used Everquest as a blueprint and made their own thing from it, and FFXIV used WoW as a blueprint and made their own thing from it. You can not agree or like it if you want, but that is how Final Fantasy has stayed successful since 1987. Presentation and tweaks to familiar systems is what has kept FF the power house it is for so long.
Not to mention, Heavensward from what little we have been given has already shown that major changes are happening. So i'll wait and see what happens.