If you’d ever had to bill millions of customers for precise amounts of electricity and gas at precise prices… you would hate floats and you’d hate that any idiot will act as though excel is gospel truth.
That's also the case with integer or fixed-point calculations. You generally don't care about the accuracy of specific calculation (unless it results in edge cases like a catastrophic cancelation in floats), but you do make sure that the resulting invoice is free from any sort of numeric artifacts like the sum of ratios equals to 99.9% or 100.1%.