A couple of months ago, in the NA/EU version, the MP/WP/SP shortcuts were spelled out in character sheets (K). This explicitly stated that MP is Mental Power, WP is Will Power, and SP is Sacred Power. It looked like so:

Then one week later, after maintenance it went back to just the shortcut MP/WP/SP. I know this is really minor, but it was nice flavour on our character sheets, and a clearer explanation where our characters draw their power from. It's a really minor thing that would be nice to have for us lore enjoyers, so please bring it back!