Pitch is just wave frequency and there's nothing special about any specific frequency. To call A 440 hertz is basically an arbitrary designation. To do that in an equal temperament tuning system is to pick an arbitrary designation within an arbitrary tuning system.
What we call an in tune A today would be considered sharp or flat at different points in history when the convention was different and the 12 note equal temperament system is a specifically European thing so I'm still pretty confused.