Cameras have never, ever been "accurate". It is not technologically possible to create a photograph that is "accurate". Cameras have always made big tradeoffs to output something that actually looks good to humans.
But actually, we have lots of excellent, well-researched and proven standards for accuracy in imaging. Cameras generally target those standards, certainly professional ones. Many cameras - quite clearly - can produce very accurate photographs.
The more worrying trend is that of pervasive post-processing, where we depart from reality and entertain aesthetics.
How?
Historically cameras have merely altered the style of images. These days smartphone cameras are altering the content of images.