Two parts.
First Part, a simple stat modifier I think would be really helpful for the devs and players is primary and secondary stat modifier for items.
Quite literally the item says + X primary, or + X secondary.
This will make a lot of cross class items, better cross class (giving a better focus to each item for a better class value spread - without giving it a crap ton of stats). This isn't to say we should void stat specific allocations, but that sometimes it would be more convenient for SE and sometimes us for it to be done this way.
Came up with this idea in the Maat request thread. Basically you could do things like
Maat capThis way you would really have +15 to your primary stats - as SE this lets them be more creative with item purposes. AS a player it makes items meant to be for all classes actually be good for all classes (as sometimes they are not).
+5 primary, secondary
+10 all (I say all but it would list them out on the item)
In a normal MMORPG this would be useless. But since there are cross class gears, and FFXIV / FFXI are not quite normal MMORPGS I think this makes the special occasion.