This is bad because he was 0% productive for many days because he couldn't input text on the computer where the problem was because it didn't have his editor.
We're 0% productive most of the time. Sleeping, commuting, meetings, lunch. Adding a negligible amount more for tooling is not really an issue.
I'm essentially dependent on Eclipse when doing Java. It takes me < 1 hour to get it set up the way I like it. For the next 2-3000 hours before I need to set it up again, I will outperform and produce better quality code than anyone using vi or emacs, guaranteed. Sounds like a fair tradeoff to me.
Back when I was on a Civil Engineering path, an elderly engineer said "I bet you don't even know how to use a slide rule, what do you do when the power goes out", to which I responded, "I go home, same as you, unless you've got candles in your desk too, and let's not even get into air conditioning".
I bet you can. But can likely use emacs as well. I think if I had to pick one piece of software to live with on my desert island, it'd be emacs (assuming I had a reasonable boot loader and a filesystem to sit under it).
I've worked with really awesome people who are completely lost without [insert proprietary single-platform editor here].