Thanks bro,I think it comes down to how much you can spend as you could get by otherwise but PD is the future of power for perhaps most devices and likely even Apple may use it in everything in the future although they would be reluctant to conform as it would cost them a lot of revenue in lighting licensing etc.
I can certainly get by.
I live and work indoors, always near a charger, and if not indoors, I am usually in my car, with a charger.
Having a power bank of any kind is just a part of me being a Boy Scout, whose motto is to "Be Prepared".