Good points.
> Honestly, I'm surprised those device manufacturers haven't shifted their DSLR stack to just be a dumb CMOS sensor, lens, a basic processor for I/O, and a thunderbolt controller that you slot the phone into. Probably heat is one factor, the amount of batteries you'd need would go up, the BOM cost for that package could be largely the same, & maybe the external I/O isn't quite yet fast/open enough for something like that.
This is not really an option. There were actually clip-on cameras back in the day when cameras were new on phones. But there were several problems:
- Software support tended to lag with updates
- Phones change form factor very regularly and phones in general are replaced much more often than camera hardware, leaving you a highly expensive paperweight
- I don't think any phones have thunderbolt yet, just some tablets
- Dealing with issues is a nightmare because you don't control the hardware end to end