People need to be able to see and hear (the audio side is arguable getting even worse) what is happening. That is the absolute baseline for making a good product.
This is the equivalent of making a website where people struggle to read the text and the designer yelling that it is not made to be viewed on cheap mobile phones. Even in our current world of user-hostile web design, most professional designs try very hard to be accessible on a very large range of devices.
And no "naturalism" has nothing to do with it. I don't think unnatural lighting is such an immersion breaker compared the horrible CGI that people are forced to made on crunch time but sure if you want to only use natural lighting, go ahead BUT you still need to make sure the scenes are well lit. There are lots of avant-garde movies with natural lighting that are well lit.