I saw the topic and I expected another thoughts direction.
Firstful I believe what you said, but I see the flaw. If you are doing overtime a lot on the job, it doesn’t make you productive. Productivity requires balanced life.
Secondful there is no answer to question to my problem :) Let’s assume I got IT job with online server supporting. That means I must be available for the others. And that’s the problem. You basically have not so much to do, but you I can’t live a life because you need to be available. It leads to productivity loss, one-sided life and lack of happiness for some people.