I understand that you don't technically NEED it since your inventory is virtually limitless, but it would be simple and definitely aid in organizing your inventory with all of the different items, armor, accessories, weapons, armor, costumes, rarities, etc. I think a item organizer should be an option for your inventory and if there were a storage system. That way you could sort it by item color, and item rank or any other organizing option that would be appropriate.
Ready Room Storage
If you look at the top of your arsenal, there is a search bar to allow you to narrow what actually shows up as you search through it, effectively helping you find whatever you are looking for just by entering a few letters (since that is usually enough to significantly narrow what appears).
-edit- did I forget to mention the arsenal is already divided into separate classifications? that is important too....
I can see the value in being able to at least hide inventory items, though; I've got a fair few bits of legacy gear that I never use, but which aren't worth paying to have unbound for sale.
Proto gear, mostly, and equipment with truncated or absent alchemy paths (Zappers, *break gear, Slime Slasher &c). Things I was given, or acquired very early on when I wast still getting my head around crafting, that I'll never, ever use again.
They're bound. I've been away from SK for a little while, but I assume that unbinding still costs a &$%#ing fortune?
Therefore, you can trade in your Grim, Forge, and Primal Sparks for the 5* trinkets at 10k a pop.
There is a sort by option just below search bar in the inventory. You can sort by star rank and other options.
It already exists...