That modularity is a pain in the ass that only photo snobs (like me) will put up with. For example: the RAW quality on my Sony a6000 was crap until I checked the firmware version, and it was several versions behind. Doing the update appeared to brick the camera, and the updating software is a nightmare. Solving the bricking problem took a non-trivial effort. Replace "camera" with "GPU card" and you get a typical story about modular PC problems.

One reason to put up with this crap is that you can save thousands of dollars buying nice old glass for your nice new camera. But even though the glass lasts forever, once you get 50MP sensors in cameras, old glass that was designed for the best resolution of 35mm film will limit the performance of a 50MP+ image sensor. Soon, photography will be mostly computational, and big old lenses will all be museum pieces.

I don't even want to think about whether I've kept the firmware on my Sony E-mount lenses up to date.