[EamonnMR]

Writing something new in rust is harder than rewriting because you need to think a lot about your memory model up front. In other languages you can leak all the memory you want and then (maybe) figure enough of it out when you've already shipped/already deployed. In Rust you need to do the up front work, so instead of releasing a leaky program, you don't release a program at all. If there is an existing program you can make assumptions more readily.