Smart watches like the pebble can be amazingly useful in certain circumstances. For example, if you're very busy and using some sort of messaging system to stay

Smart watches like the pebble can be amazingly useful in certain circumstances. For example, if you're very busy and using some sort of messaging system to stay in touch with a team then a smart watch is indespensible. You can keep up with the message flow without digging out and unlocking a phone. It easily replaces radios without many of radio's downsides and with many unique advantages (archived messages that can serve as a reference later). I don't know how useful they are in the general case though. But they do lower the friction of keeping up with a textual conversation without being in front of a computer.