Having coded full-time in Swift for 2 years now, I can attest that strongly-typed languages really do a lot for code quality and especially reliability. Sure, you still have semantic bugs all over (that's what tests are for), but whole classes of bugs (null-pointer refs, dangling pointers) are at least greatly reduced. As long as I stay away from the no-nos (like implicitly unwrapped optionals) and use the goodies (immutable models; enums with attached values; generics), my apps hardly ever crash now, once out in the store.