That sounds nice, but practically a lot of web app development can't be perfectly modeled by a type system. There's a lot of string munging and bashing, because

That sounds nice, but practically a lot of web app development can't be perfectly modeled by a type system. There's a lot of string munging and bashing, because at the end of the day we deal with messy human inputs, and the required bookkeeping makes that tedious and inexpressive in Rust.