> There was a stellar developer experience. Yes it did not have intellisense, but all the changes that I did appear on the web instantly.

> ...after I deployed bad code and it blew up in someone's face, I got an email that not only shows a perfectly readable stack trace, but also a line of source code for the frames.

This is an odd contradiction. On one hand, he values the fast feedback loop you get from edit-and-reload style development, but on the other, he doesn't appreciate the instant feedback from the type checker saying it's not gonna work.