When I first started programming seriously (which happened to be early node.js, before any of the type systems), the lack of types was aneurysm inducing. That, combined with the tendency for libraries in dynamically typed languages to have less than ideal object documentation is very frustrating. It seems impossible to keep track of data flow in any decent sized project, and otherwise tedious.

I don't know whether this is an unpopular opinion (seems like it might be?) but I would never tell anyone to start with a dynamically typed language.