Inventory UI shrink

what was the purpose of making the inventory window, which was already too small when "expanded" option is selected....even smaller?
why can't there be one tab for inventory and one for quest items.
there is an entire, useless, UI element for showing inventory slots, when instead...you could just view all your inventory slots.
i don't get it.

See this post from Minagawa-san of the UI team.

As for the uselessness of the Inventory Grid hud element, you're just not using it right.

Man, that didn't get any saner-sounding with the passage of time.