Sure. But you don't actually need to comprehend the number for that, and you don't need to check thousands of lines for it, either. There are addons to keep track of that kind of thing if you really care about it.
Bottomline being, there's no need to actually be able to read and understand those numbers in the middle of combat.
You need a reason for the effort to be worthwhile to Blizzard though. Not a reason for it to be worthwhile for you, in which case i might as well ask why you haven't produced an addon to solve your issue yet.
The people you're talking about are the ones that don't really care about numbers in the first place. Which renders the issue irrelevant anyway.