> as colossally ignorant as the writer
Your bias is showing. They never said that Vim/Emacs _doesn't_ have those. And modern IDEs generally make them much more discoverable and usable.
No-one is saying that "Vemacs" can't do everything that IDEs can do - they clearly can, with sufficient configuration, plugins, and so on. But the IDEs are generally "ready to go out-of-the-box"