The dealers don't even get it perfect buddy as ive had to fit new badges on cars titanium ones to be precise and no measurements are given.
There are lots of things the dealers don't do right or don't care enough about to do properly. That doesn't mean we can't do them right and take pride knowing we've done it right.
I, like the OP, would want it to be done exactly right because we care about the tiny details. I think it makes a car look terrible if the badges or number plate etc aren't straight or in line. Obviously just because you don't want your badge to be exactly in spec position doesn't mean you don't care about your car, just means we're all different and want different things from our cars to satisfy us.
Chris