Whats the point of legendary items

@Tperodactyl RNG (Random Number Generation). Everything is based off a random calculation every game. Some areas have better RNG. The train guarantees atleast 1 purple, usually 2 and sometimes a gold. The vault usually has gold items. Try landing trainyard or sorting factory. I almost always find a key there.
There is a small chance you could find 3 gold armors in one loot crate. That is the nature of randomness.