Interesting, I also keep coming back to text files for productivity, because of the speed and simplicity. Some of the points the author mentions though like due dates, a journal/schedule and version history still aren’t really solved very well I think. Not to mention collaborating in a team that way (not a requirement for the author I think, but something I could use myself).
I actually tried simply using VSCode for a while with just a plain text "todo.txt", "schedule.txt" and "projects.txt", but that didn’t scale very well (also didn't really get things like autocomplete to work properly).
If anyone’s interested, we decided to see if we can actually solve this ourselves and are building an editor/IDE from scratch now, but specifically for "todo.txt" (https://thymer.com).