[uludag]

I don't find it controversial. I think it's a decent heuristic that's simple to implement. It would be pretty trivial to extend this with other heuristics, like how often commands other than self-insert-command are ran, their frequency and duration. Then the author, if they wanted, make some classification model with their lossage. Add in a few manual toggle keybindings (maybe with some numeric options to set duration as well as some defcustoms), org-mode clock-in integration, pomodoro integration, calendar integration (like with org-caldav) for setting status during meetings, slack notification setting updating, and I'd say you'd have a pretty thorough implementation.

And editor typing detection is the perfect place to start.