> Software on the actual camera is yet another question for me, why don't we have cameras with full fledged modern OS-es running custom androids for example with installable apps so you can finish a lot of stuff on the camera itself or make sharing to wherever a breeze.

A little more than 10 years ago Samsung tried that with their Galaxy NX (a bona fide DSLR running Android). It flopped and most reviewer noted that it a generally sluggish camera; a deal breaker when one of the design constraint of all their other competitor is to be reactive.

We mustn't forget that the main purpose of a camera is to take pictures, not to connect to a network.