If you can tolerate departing at less than MTOW and the cost of a tech stop .. then that is a fine technique ... the commercial reality is that it is a luxury for most of us folks.
John, you are very rarely wrong.
However, I'm afraid on this occasion you have, like others here, failed to recognise that the gross risk related to the non-engine-failure-related hazards inherent in an extra landing and takeoff (the tech-stop) outweigh the reduction in risk gained by departing at less than MTOW.