I have read a few feature lists of Sierra now. Maybe I am missing something, but the feature list doesn't seem to offer me much.
* I don't have an iOS device, so that rules out 75% of the new macOS features.
* I don't have disk space issues.
* I don't use Photos, I use Lightroom. (couldn't they have just updated Photos app?)
* I don't use messages. (couldn't they have just updated Messages app?)
* I don't use iTunes. (couldn't they have just updated iTunes app?)
* I don't talk to my computer, unless I am swearing at it.
Sounds like a troll, but I am generally always an early adopter, but I find nothing compelling in the feature lists I am seeing....
edit: seems @robertosh beat me to it for the most part... and he has an iPhone.
Love the "...swearing at it" comment. Been there... Will probably be there again...