The irony of being a persisting (n)vi user since BSD4.1 1982 is not lost on me.
Everything I have tried has gone or transformed, going back to wordmaster and zoomracks (I remember when Apple settled with them, presumably for HyperCard and then killed off HyperCard)
Integration level? zero.
Emacs is what truly taught me the importance of dominating control over text on every level, not only on the composition side (writing, editing, revising), but on the consumption side as well. I'm reading this thread inside it, just like I'm writing this comment in it.
This unsurprisingly come to be enormously consequential in the age of LLMs. I can type a question anytime, anywhere and send it to an agent. I can select a paragraph and ask to summarize it, fact-check it, fix mistakes, re-word it, ask for multiple variants of rephrased text. I can do it in the middle of typing a Slack message, a code comment, function name, git commit, pdf annotation, shell command in the terminal, etc.
I control video playback directly from it. I can read through the transcript and play it "karaoke style"; I can move the cursor and it forwards and rewinds to that exact point in the video. I can take a snapshot of an area of my screen and it can OCR the text out of it. I can point to a piece of text that looks like rfc3560 and immediately browse the damn document, right there. I can do the same with Jira tickets - point to a piece of text and fetch all the related PRs.
Anyone who tries to compare Emacs to any other "text editor" or IDE has no clue that Emacs is not a fucking text editor. It is a damn text orchestrator. Most people, even majority of Emacs users are clueless of what it is capable of.
These days, it can even handle Doom-level graphics at 60fps. Yup, not a damn "text editor", I'm telling ya'll.
It is very more likely a skill issue for him.