While endurance helps it isn't so straightforward as /just/ increasing endurance. Efficency gains can more than pay for the cost of additional manufacturing for one. It is something which calls for doing math on a case by case basis essentially.

Going from Incandescents to LEDs and similiar caused the energy usage to go down in spite of increased always on electronic device usage. Replacing a hummer with a Prius or Yaris wins out quickly.