Indeed. Types are useful because they span module boundaries. I've been working in Scala and C++ lately after working for ten+ years exclusively in dynamic languages and I can't tell you how happy I am to let the compiler catch my dumb mistakes. IMO, dynamic languages optimize for the rare need for freeform metaprogramming at the expense of the common need for easily maintained code.
Dynamic language enthusiasts will tell you that testing is better than static typing but in my experience static typing eliminates about half my test code and gives me much more immediate and precise feedback on my most common errors.
Dynamic language enthusiasts will tell you that testing is better than static typing but in my experience static typing eliminates about half my test code and gives me much more immediate and precise feedback on my most common errors.