I'd like to see some changes to the inventory. Right now it's 100 spaces and I know it was increased from 80 before but it's still not working out. I think the main issue is the space equipment and tools take up. In most mmo's you play one class and you might have several sets for different purposes. Takes up quite some space, but ok.
But it's different here in ffxiv. The developers encourage you to try out and level several classes simultaneously. The encourage it by having cross-class abilities and they enforce it by making our xp/sp get fatigue.
The problem I have with that, is that it takes up a lot of space. To be honest, almost half of my inventory is tools and equipment. Low lvl craft gear, high lvl craft gear, mining gear, battle gear(I already choose for either magic or war before I go out), and then the weapons/tools(2 each craft).
One possible argument would be not to have many different classes or just carry around the items needed for just 2-3 of them. But I don't find that a valid argument. And that's because the game almost forces you to have multiple classes, so I believe they should also accommodate that inventory-wise.
I would suggest to have equipped items not be part of the inventory(you have to go to the 'gear' option anyway if you want to unequip). And on top of that I would suggest a 'gear set' option. That way I can define maybe like 3 different sets in my equipment/gear screen and not only have those items not fill up my inventory but it also allows me to switch gear quickly. This will reduce the needs for tedious macros.
I don't see many other options to get this done. Just removing the equipped items from the inventory would not make enough difference in my opinion. And of course they can't go and remove tools, weapons and clothing from the inventory all together because that would unfairly favor people who craft that.
And yes, I'm aware we have retainers with space. But that will 1. require you to run there all the time you want to switch classes, and 2. cripple your selling ability if you use your retainer as a bazaar.
Edit: Added another suggestion
Another issue is organizing your inventory. Right now you either have everything in order you received it, or sorted so the first part of your list is filled with clothing, tools and weapons you can't equip in that screen anyway.
I assume it's done to accommodate gamepad users, but I find it very annoying.
I want to be able to organize stuff myself, either with predefined tabs as suggest or give me the chance to make tabs myself. So either split the inventory in different bags, or just give it several custom tabs. That way I can put my battle gear in 1 tab, my crafting gear in 1 tab, my blacksmith ingredients in one tab, my ** ingredients in one tab and have a tab with whatever is left.
Especially in a game with so many different items and crafting requires 15 different ingredients to make the end-product I crave for a way to sort and organize stuff myself.
And it gets even more complicated since I also have 2 retainers full of stuff I use. Which means that every time I need an item I have to scroll through 3 lists to find my item. So yeah, if I turn the sort button on I have a vague idea where the item is. But I rather be able to have both me and my retainers complete inventory on my screen immediately.