This seems to me to be extremely uncharitable point of view.

But let's roll with it.

I advocate type systems.

I've also worked in several non-trivial projects in lua. Several non-trivial projects in python. Several trivial projects in common lisp. Several trivial projects in erlang.

Additional I've worked in a non trivial project in ruby for several months. And one non trivial project in node for a year. Both of these in a professional 8 hours a day capacity.

I still advocate type systems. More so after working in dynamic languages.