I agree that power reserve indicators can be more useful on an automatic watch than on a hand wound timepiece. Unless you have a HW watch with a long power reserve you will wind it daily as it is so the PR indicator is superfluous. On an automatic watch, especially one that is not worn daily, you will know when it's about to die. In reality most PR indicators are not needed. Personally I'd look at a large date complication or moonphase before a PR.