I understand your point. My wife is a daily user of our PowerCores while working from home. One of our PowerCore 13000 is still rocking after 6+ years of use haha. I’m just thinking more of the quick charge when we are away from home traveling (Hotels, Family houses, etc) but completely get what you mean about not being tethered so to speak.
Ended up ordering two of the Nano 3’s, so shall see how small these guys are and how well they work.