Indeed the blue light on the Mazda2 instrument cluster is cool but I agree with the writer of the article, that we can really use a real temp gauge along with the blue light, it just makes things that much better.
Yes, I know that our 2011 Mazda 2 doesn't have a real temperature gauge, and I know that some feel the blue and red thermometer icons are a poor substitute.
But now that the mornings are getting cold I really like the blue light.
Unlike a near-motionless gauge, the bright blue lamp draws attention to the fact that the car is cold, too cold for the heater to do anything other than pump freezing air into the cabin at a time when I really, really don't want it. And it's timed to wink off when the engine's coolant is juuuust warm enough to make some real heat -- an important thing to know in a car with manual climate controls.
Would I like a gauge? Would it accomplish the same thing if I watched for the needle to lift off the peg? Sure, but that's not something I see out of the corner of my eye as easily as this. I mainly use a gauge to monitor things on the hot end of the spectrum.
Even if the Mazda 2 had a proper temperature gauge I'd want to keep this blue light, too. It's special.