Because the TV wouldn't be as good a representation of the original painting as the canvas print would be. Similarly, vinyl wouldn't be as good a representation of the original sound as CDs would be.

I'm guessing you're not a musician or studio worker, or I wasn't clear.

If I am using an analog device (in my case tube amplifier) I want to listen to something that was mastered on analog equipment. If it's square wave pressed on to vinyl you might as well stream.