What is so good about a Smartwatch?

I remember when the google glass came out and I thought to myself, do we really need to be this tied to technology?  Wearable smart tech has now become in itself a tech category.  When Apple announced they would make a smart watch, we almost got bored waiting, whilst other brands emerged with their version, to get a jump on the market and fulfill the demand.  Samsung, Pebble, Motorola, Sony, LG, and finally Apple.  It was almost like Apple were waiting to see if this Smartwatch thing was really