I find that a significant fraction of the bugs introduced to the code bases I've worked on that have dynamic typing are due to issues that even a rudimentary static typing system would prevent at compile time. I'm struggling to grok how a language with no type system might look. Something post-modern and Picasso-esque? To use data in a meaningful way in a program it must be possible to reason about it, and that requires that it have at least some structure.

Types aren't new. As the article discusses they date back over a century at least in math and logic. Within programming, we've had them in every major language for decades. The first big push for strong and expressive type systems is from the functional programming work which led to the ML family and the work that made Pascal and Ada on the imperative (and later OO variants) side, which dates back some 40-50 years now.

What is "he" right about, exactly? You say "yes they can be useful", but that's not the impression I get from OP. I am also confused because the very quote OP is responding to states that "...type systems are not enough to prevent all the problems in logic and programming...". Do you consider that acting like type systems are a cure-all?

> Most bugs aren't type related, and you're adding additional mental overhead with these extremely elaborate type systems.

Are you? usually I find it to be the reverse - you're leveraging the type system to track some properties for you, so that you don't have to track them mentally. I.e. less mental overhead (though possibly more boilerplate-overhead)

For me, the elaborateness of the type system and it's checker REMOVE the overhead. YMMV, obviously.

I think you misread OP, and also misread the comment he was replying to; or, you just needed an excuse to vent about type systems.