Another factor discounted from their research is the time per employee spent in their own time furthering their tech skills. That extra hour a day I spend to stay on top of the game always comes in handy when I want a different employer or job. Those trying to do it only on company timeand not a minute of their own time may have my gender, and may have been in the industry as long, but they're missing more than 6500 hours of exposure. If we trust the BS metric of taking 10,000 hours to master something then my level of mastery and theirs can never be the same thing.
Thus we lay to rest for all time the myth of similar employees. There are no similar employees, let alone identical ones.