I know what you're getting at, and some people will obviously have a hard time deciding. But I took this into account, because I think more often than not, the people who come up with X results are the same people who will receive an improper type result from existing tests.
I could have made this a lot easier to make decisions in, but that wasn't the intention.
Yes, there is definitely a tradeoff between accuracy and simplicity.
Personally, I lean towards the accuracy side, but if that's not your goal, I'd say your test is pretty good.