In five years of brewing, I've hit the exact SG once. Consider a 5.0 gallon wort at 1.048 has the same amount of sugars, etc. as a 5.0 gallon wort at 1.053 Even an extra quart shifts it 2-3 points. If you want to be compulsive about SG, keep a bag of extra light DME around & cheat.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk