It's because percentages are more misleading for humans than "x-times". 95% and 97% sound very close, right? They're not. 95% is a 20x reduction, while 97% is a

It's because percentages are more misleading for humans than "x-times". 95% and 97% sound very close, right? They're not. 95% is a 20x reduction, while 97% is a 30x reduction. Percentages create a singularity at 100, which is why the effect is more pronounced the closer you get to 100. It's just like how saying something is "95% effective" sounds very convincing until you realize that's a 1-in-20 failure rate.