I actually take that as a positive item. He's able to effectively write code using just the terminal and vim. It doesn't get simpler than that. I really hate having to use something like Visual Studio or even VSCode. They're bloated and use a ton of resources. Playing around in Pharo is fun for a bit, but same problem.

I 100% agree that it seems like you can't unwind the stack the same way you can in Common Lisp or Smalltalk though.