Is a dumbphone that also charges your smartphone brilliant or idiotic?

Simple feature phones are commodity items, and so are power banks, so why not combine the two? Generic Hong Kong tech-rebadger Zuri has given it a go, making the “Power Bank U28” — a basic dumbphone that can also be used to charge your smartphone.The question is: is this brilliant, or idiotic?I don't need a dumbphone. But if I did, I'd want one that doubled as a charger for my smartphone. pic.twitter.com/MvwIvJRV0e— Harry McCracken(@harrymccracken) March 2, 2017The back-a