> I'm also thinking of my favorite things about languages like Racket and Python which is a really simple editor that is built-in. I've heard this before but I

> I'm also thinking of my favorite things about languages like Racket and Python which is a really simple editor that is built-in. I've heard this before but I've never really understood it. Why on earth should language designers spend time and effort building a toy text editor when damn near everyone has VS Code, JetBrains, Sublime, some flavor of vim or emacs, etc. available to them? Why would anyone want to learn a new, completely bespoke editor just to play around with a new language when you can install a language extension for the editor you're already using in seconds? I'm genuinely asking here. What am I missing?