It's called management. Stop hoarding stuff.

Having dealt with Final Fantasy XI with a fraction of the storage space and pretty much the same amount of items if not more, the amount of space we are granted in XIV is almost preposterous.

Get rid of what you do not need in the immediate future. Learn to manage your space. If we were given 1,000 more inventory slots, players in 2 months would still complain "we don't have enough". Of course you have enough. Learn to minimalize.