Because doubling, quadrupling, etc. the number of servers is quick and has a well-known cost compared to going for a complete re-write in another language? I'm

Because doubling, quadrupling, etc. the number of servers is quick and has a well-known cost compared to going for a complete re-write in another language? I'm a massive go and rust fan, but I don't expect the entire world to be re-written in them any time soon.