Actually, if you dont want a smartphone but just a phone that has whatsapp and can call then this is pretty good. I have considered it myself using a phablet in combination with a feature phone and dual sim card. Calling with a phablet is just ridiculous.
Also if you want to go out or something its really nice not to worry about your phone getting stolen from time to time.
Just because you cant find any use for it doesnt mean there isnt a market for it.
Advantage: One key to battery life is.
Make it so no one will stare at it on for hours on end.
Mission accomplished.
Seriously though, it should be a decent back up phone, but who these days that is into smartphones, doesn’t have one or two already as back ups.
So starter phone for kids would work.