I think AR and VR are actually progressing at a reasonable pace, tech like the apple vision pro and the bigscreen beyond are beginning to converge to a comfortable and powerful experience and AR will be better supported by a platform like the vision pro than by any previous major industrial AI offerings like the hololens. I think in the short term people will move to external compute on a puck worn on the waist much like the battery of the vision pro was but with all or most of the compute power.
I think BEVs will continue to advance, without even considering a major technological breakthrough I expect they will out-range many ICE vehicles very soon. If solid state truly goes commercial scale it will be even sooner.
Mobile phones I actually think are stagnating. You're right that there's more power in them than necessary these days. Batteries get bigger and cameras get better but not much else changes. Interested to see where they go.
They don't want to be contacted. I don't think we have any moral obligation to supply them with medicines or technologies that they don't want, even if they would objectively improve their quality of life.
No they will probably never advance substantially in technology. To get to where the developed world is today took centuries of industrialisation and trade.
But there are, presumably, happy with the status quo.