The amount of inconveniences in this game bother me everyday and it's quite surprising that people don't speak up about them. Not only these features are flawed, I'd say they are probably the worst I have seen handled in any MMO. I will explain -
1. Inventory System - The game highly encourages you to level all classes on one character, but yet we're still stuck with the same inventory storage we have had since day one. I know they released additional retainer services and it has been discussed, but why are we paying a price when other MMO's (even F2P MMO's) give more storage for free? This is usually done by craftable bags. They increase their amount of slots as the game ages with more content and many MMO's also have a separate tab for crafting mats storage. Here in FFXIV, new items/gear are being thrown at us every patch and yet not even a single attempt at storage increase.
This also brings me to my second point...
2. Glamour System - Again, the worst I have seen handled in any MMO. Want to keep those hard earned pieces from raids/crafting for glamour? Well, throw them all in the same inventory which is already hurting for space. Other MMO's handle this by giving you costume slots, extra storage or the transmog system by Blizzard in WoW/Diablo games. All I gotta say, good luck when the Heavensward expansion comes out! Hundreds of new glamour and crafting mats with your same old storage. I have an extra retainer and even that's already filled to its teeth.
On a related note, it's also incredibly inconvenient how we manually have to pull out items from retainer for crafting. Get on with the times already and just let the crafting system automatically use items from all your storage.
3. Housing System - Another poorly handled feature. Even F2P MMO's nowadays give you *free* housing with no server capacity issues. Here in FFXIV, first you have to save insane amount of gil and then good luck finding a house to see if they're still available. Why?! Let everyone enjoy housing, at least a small plot should be free and available to all characters. See games like Wildstar or Rift, you reach a certain level and a quest pops up "here's the key to your house!". It becomes part of the replay value for the games, so why keep it away from majority of players?
4. Beast Tribe Quests - The most worthless reputation grinds. You grind daily quests for a month straight just to get a silly mount. After the first beast tribe, many people didn't even bother with the next ones. Now all of them are dead zones. Reputation grinds have always been known to be part of "endgame", but here they are so butchered, this is one endgame that's best be avoided.
5. Party / Chat System - Where to even begin with this? I'll keep it short - still no private messaging inside dungeons or cross-server, no parties cross-server and an absolutely non-existent raid system. Alliance system is a joke and there's no true raid that you can experience in this game. Only 8 player parties that even some indie developer next door could support in his two dollar budget title. Not to mention the solo questing, prepare to go through it all over again in the expansion... on your own.
6. Deteriorating Raid content - Three of the new Coil bosses are re-skins, same old circular boss arenas and rehashed mechanics with no attempts at any originality. Are they even trying anymore? I mean it's only 4 bosses every six months to begin with, so some efforts would be nice? The new relic questlines also feel tacky and not well thought out. Original questline was much better.
All I can say, I hope the expansion changes directions for this game -big time-. It's getting stale, inconvenient and not enjoyable anymore. I want to like the game again, it has so much potential but only if they decide to listen.