alt Hacker NewsLinux cameras can be made to work well, it's a matter of software. Case in point, newer Ricoh/Pentax cameras actually run an a Linux firmware. (See: GR IV and K-3 Mark II/III). Parts of the software stack are already there, but noones had the will to glue it together correctly for a mobile device usecase, yet.
It's not about will. You need quite some HW for proper calibration, or cut corners a bit. Calibration is otherwise a few step process with some steps having substeps for each light source type.