I was inventing the smartphone when most of the people on this site were still in second grade, so that's definitely not me. However, good taste is a key to success. It has always been true and remains true that people do not want everyday objects turning into software hassles. Nobody ever wanted to upgrade Flash Player on their "smart" TV. Ever. Nobody wants to have to charge their car keys. Nobody wants to charge their motorcycle helmet every 2 hours of riding.

Here I am using a definition of "nobody" which means "a number of people so close to zero that it will be virtually impossible to create a successful company serving this tiny or non-existent market."