Artists are not above criticism. They don't have to listen to it, but we are perfectly entitled to say what we think of an artist's work. I'm sure you've come across plenty of photos or songs or film clips that you took issue with for all manners of various reasons.
And games are not just art, but also business. This stuff has to sell. The games in question tend to be the larger budget games, which are funded by big publishers who expect these games to provide a return on investment. They are still products. So this is all in the realm of consumer industry, where, for better or worse, you cant just ignore what the consumer base thinks of your product. I'm not saying they should completely cater to every whim of what consumers ask for, but I think there's some level of adjusting your own product so that it doesn't put off would-be customers. Besides, I don't feel that CA's inclusion in most games nowadays is coming from some individualized, artistic vision, but because it's become trendy. We've seen trends before with things like lens flare and piss filters that are not necessarily born from artistic inspiration but because its what everybody else is doing. The application of CA in most of what we see in gaming is not achieving these hypothetical goals of the effect that people have described.
This just sounds like an argument from an idealistic standpoint rather than a practical one in the face of what we're actually seeing.