I've always started with the smallest artboard size when designing for mobile and web in Sketch. I'm pretty sure that was collectively agreed on by the community and encouraged–right?. I'm finding that allot of the new iOS10-9 GUI templates, including the IOS template in Sketch are starting with 375px, which is not the smallest size. Any thoughts on why?
This made me look up screen resolution statistics.
According to this we should definitely still be considering ~320px width!
I expect they're just responding to demand though.