Silicon is one thing, but the comment you’re replying to specifically mentioned batteries. Non-replaceable batteries offer a modest reduction in size, at the cost of reducing the device’s service life to 3-5 years. I personally don’t find that to be an impressive advancement in technology. The design’s lack of respect for user-serviceability reinforces the other user-hostile features of the iOS ecosystem identified by the grandparent. (Sent from my iPad.)
> can't open it to access h/w, change battery, etc...
We're necessarily moving closer and closer to monolithic ASICs that cover all functions of a phone, most likely encased in epoxy for complete waterproofing. Some guy with a screwdriver and multimeter will never be able to keep up with advancements in manufacturing/technology.