Why are the upgrade descriptions dumbed down to the point of complete uselessness?

This is something that boggles my mind from the beginning. Why are the basic upgrades so terribly vague (shoots super duper fast) and the last ones completely useless (Bloons a problem? Here's the solution.) instead of providing at least some accurate information (increase range by 15 %)?

I mean, there doesn't need to be a math formula in every description, but the game forces you to literally reverse-engineer its inner workings.