Seeing as the game's development is constantly fluid, I'd say we won't be getting too many "solid no" responses from them. They stated that they are continually optimizing the game, which leaves opportunities to add more improvements. It's really not a question of whether they can or cannot do it, but rather can they afford to do it at the present time.

Quote Originally Posted by Bayohne View Post
Q71. After 3.0 launched, my inventory and Armoury have been super full. Do you plan on adding more inventory space?

A71. I understand everyone’s request, but since additional inventory space would increase the data transmitted, there is a risk for server crashes, so this isn’t something we can do right away. We’re optimizing aspects with every patch, so we will continue to look into this for the future. Until then, we would like to add a feature that stores and retrieves whole gear sets to and from retainers, and make other quality-of-life changes to retainers.
I'm also interested in more information regarding this set storage system they are referring to.