Earlier quoted context omitted.
But why when the “-“ works just as well and doesn’t require holding the key down? You’re not the first person I’ve seen say that FWIW, but I just don’t recall seeing the full proper em-dash in informal contexts before ChatGPT (not that I was paying attention). I can’t help but wonder if ChatGPT has caused some people - not necessarily you! - to gaslight themselves into believing that they used the em-dash themselves,…
No. En-dash doesn't work "just as well" as an em-dash, anymore than a comma works as an apostrophe. They are different punctuation marks. Also, I was a curmudgeon with strong opinions about punctuation before ChatGPT—heck, even before the internet. And I can produce witnesses.
It's be just as wrong as using an apostrophe instead of a comma.
Grammar is often wooly in a widely used language with no single centralised authority. Many of the "Hard Rules" some people thing are fundamental truths are often more local style guides, and often a lot more recent than some people seem to believe.