Maybe because this is something very close to my wheelhouse, but this article seems to be overly wordy for something obvious. Smartphones are simply more convenient than a standalone camera can ever be. Add on top of that the incredible computational imaging capabilities that have been developed over the past few years and the quality of images you can get from the size of optics and pixels that these devices have is…
https://www.playmemoriescameraapps.com/portal/
They are almost universally features you can get on your phone cheaper or even free with much better UX. Maybe at the resolution or raw area or some other dimension they might be better. You can also tether to your phone but why would you? It's just too tedious.
I don't think anything is going to save cameras. I keep one which I pretty much only use for super telephoto (400-800mm) and for ultra wide/fisheye. If a phone optically offered both of those things built in I'd stop using that camera completely.
Note: A snap-on 3rd party lens system would not get me to switch but a built in mount might (if Apple or Google or Samsung, ideally Apple, designed some kind of mount for lens I'd totally by them). In fact I'm a little surprised Apple hasn't already done this. I can imagine 2 or 3 tiny notches or mag-divits or something in the back or edge of the case near the lens that external lenses attach to. Apple could offer 2 or 4 lenses and maybe a ring light and easily pull in another billion a year as all the instagrammers go buy them all.