Implying the UI has anything to do with "crunching numbers". People were "crunching numbers" on XI, while having the worse UI ever. Can't people understand once and for all that no matter how the game design or the UI are, there will be ALWAYS players whose goal is to min/max everything.
Now, it is your choice to be part of a LS that is hardcore and will focus on success above everything (even if it means playing with Excel and parsers between two raids), or be in a LS that don't care and just play without worrying about numbers...
For everything else (content you do in PUG / EXP / etc.) no one will ever care about numbers. (You may always have someone in your party being like "Oh I rox my DPS is over 9K" but that's about it and it was the same on XI every time a BLM would lend a big nuke...)
You have 10 millions players on WoW, far from all of them are min/maxers and worry about their DPS, HPS, and so on. You have a lot of people who just play and enjoy the game without worrying about that. Those two ways of playing can coexist just fine.
(Note: I didn't use "Play for fun" as an opposite of "Min/max" on purpose. Because crunching numbers is fun to some players)