Don't you think that by trading off complexity of the models you use general usefulness? For example, the 80-20 principle is not about the numbers 80 and 20, but it is just an x-y principle where 80 and 20 are areas of a (particular) curve. If you teach it as "the 80-20 principle" then maybe at best it's a mnemonic for some people in productivity. I'm sorry, but I'm not a fan of productivity tools based on improperly…
Also, "HN's".