Because when you’re dealing with measurements that are in the billions or trillions, you start working with orders of magnitude instead of specific numbers. A difference of a million miles is insignificant when the galaxy you’re measuring is 500 trillion miles away.
As an O notation enjoyer, I don't get why people are so obsessed with constant factors. Is it exponential? Bad. Is it polynomial? Good. That's it basically.
As a theorem prove enjoyer, I don't get why people are so obsessed with variables in their exponents. Is it undecidable? Bad. Is it decidable? Good. That's it fundamentally.
Imagine someone who has his mouth wide open, tongue sticking up toward the roof of jis mouth, with his head tilted back as I screaming to the sky. You see the tongue and mouth from below due to perspective, as well as head tilt.