On point 3, we have made huge strides in miniaturization of electrical components since the dawn of radio; we have also made huge strides in battery technology.
That would suggest it's physically possible to build better devices, so maybe the limiting factor is more #2 nowadays, the ability to innovate is capped not by physics but by regulation.
Sure, things like LoRa exist, but are not widely useful.
If iPhones were a little more brick-like, maybe we wouldn't need to dump money into ISPs pockets; we could just have a standard communication language to bounce packets around. Then we don't need to pay cell phone bills, just buy new batteries.
