No offence, I'm sure you love this device, but to me this sounds like a wafer-thin marginal improvement that does not seem worth the effort required to keep yet ANOTHER device charged. Seriously, we're talking 2 seconds saved per look? If the argument is "it adds up", you're looking at you smart device (phone or watch) too much! With the watch you then you have to decide whether or not to take your phone and fiddle with it. IMHO everything on this list works as I want with a phone, except checking the time, so I have a Swatch from 2004 for that (which has a replaceable batteries that lasts years each).
Smart watches as they currently exist fulfill a manufactured desire (again, IMHO!)