Rewrites have probably saved Dropbox 10's of millions of dollars. They just have to be done well. They've rewritten many critical components in the last few yea

Rewrites have probably saved Dropbox 10's of millions of dollars. They just have to be done well. They've rewritten many critical components in the last few years (magic pocket is a big one, nucleus) to great success. Where rewrites are bad are when someone comes to a codebase, goes "wow this sucks I Can do this better", and starts from scratch. This is worth calling out because it's quite common, but it's very easy to avoid. I'm a fan of Python for what it's good for. I use it professionally, and built a product around it. I'd be happy to see Python perf wins, but I'm never going to expect it to compete with other languages.