Perhaps to you, but not me. If there's banding (it becomes even more obvious when video is actually playing as the bands will move around) that can be very distracting and suddenly remind you you're watching a series of moving pictures and this pulls you out of the story.
High picture quality enhances the immersion of the viewer in the film. It's poor picture quality that is distracting and can lead to your brain focussing on the picture quality instead of the story.
We're not talking about subtle pixel differences. We're talking about massive, glaring differences. If you can't see the banding in that last comparison shot, then lucky you.
Perhaps you should go back and re-read the post you were responding to? The guy wasn't complaining about that. Yes, some people are willing to trade quality for convenience and that's great if they want to do that.
The problem comes when people claim that the quality of iTunes 1080p comes close to matching blu-ray when clearly, it does not.