A consern about space efficieny since stormblood is not getting enough space increase

[Naunet]

Oh you sweet summer child if you think this is anywhere close to how the sleaziest f2p MMOs handle inventory.

Renting inventory space? I've played f2p MMOs - heck, I play one right now (WildStar) - and I've never seen one that rents inventory space. The fact of the matter is SE is currently worse than f2p MMOs in this category.

Irrelevant to whether or not the amount of inventory slots being added is significant

It's not irrelevant at all. The fact that it does nothing to address the actual problems of inventory by definition makes it an insignificant change.