Why would I want to see the total damage I've dealt with a rune instead of the **damage it will do right now??** I mean, I know I say this a lot, but, like, THAT'S autism. Only the most obsessive people would even care about that while in-game.
Also, having 3 rune pages is not nearly enough. Especially when there are FIVE trees. No one wants to redesign their entire rune tree EVERY game. This is why no one complained about having 20 mastery pages, because HAVING 20 WAS A GOOD THING. People only had 2 rune pages without buying more, but 1) you could buy more and 2) old rune setups were very generic. 3 pages only is absolutely insane.