The problem is that dynamically typed languages help make it unnecessary to implement your own type system when the built-in one is not flexible enough.

It may be not visible on toy tasks and examples, but enterprise solutions may need their "typing" to be done on system users' terms, and not hardcoded in the language.

I believe that both statically and dynamically typed languages should be taught and learned.

Of course, strict typing (like in Python) vs loose typing may be a different matter.