While browsing Kickstarter, I came across the Light Phone.
Applying constraints is a key part of product design, and the Light Phone certainly does that. It delivers far less capabilities than any smartphone: It makes and receives phone calls. Period.
But it's the tagline that really caught my eye:
How could this be the mantra of a successful product?
If we've done a good job as product designers, customers should be using our products non-stop, and 'not be able to live without them.' Success = maximum engagement, amiright?
Maybe that's why a market exists for the Light Phone. It gives people an escape hatch from all of that engagement, while still enabling connection for emergencies or pressing needs.
It's a brilliant example of a commitment device - a method for individuals to make lasting changes in their behavior. Think of Ulysses tying himself to the mast of his ship so that he was unable to respond to the siren's call.
Designed to be used as little as possible.