Not just 10 percent, not just 12 percent, twelve point TWO!
This sounds like my engineering classes where students were warned that just because their calculators will come up with 6 significant figure, you do not design in a 198.325 ohm resistor.
I remember being taught that fallacy too.
Maybe Cruzoids fall for promises like that - me, I want to see a genuine analysis, with assumptions, and explanations of what is in the model so, like any good engineer, I can drop it off the second floor balcony and see where it breaks.