HDR seems like another TV sales gimmick. Isn't HDR more about capturing the image with a lot of range rather than displaying it as such?

Color support does seem to matter in a side by side comparison for me. My MacBook pro colors "pop" a whole lot more than my gaming monitor's colors do. When I don't have them right next to each other, however, I hardly notice. It's hard to tell if it's the color (I think it is) or the resolution.