I can't think of any real world reason in my personal life for needing more decimals than 3.14
If you keep your feet on the ground, that's probably enough for most things. But your grandchildren will probably need more, as spaceflight becomes commoditized. A couple of decimal places might mean the difference between landing on Mars, and icy death in the vacuum of space.
If you keep your feet on the ground, that's probably enough for most things. But your grandchildren will probably need more, as spaceflight becomes commoditized. A couple of decimal places might mean the difference between landing on Mars, and icy death in the vacuum of space.