Took my Outlander to get new tires and my rear brakes were .3mm and fronts still .7mm..(72k miles) I asked them why that would happen since fronts always wear quicker.. They couldn't answer.... I told them that I was a very easy braker in that I try not to use my brakes as much as possible even in Stop and go traffic.

Yeh, I'm that guy who leaves room... sorry!

... Anyway, I searched the web and here is what I found. Seems viable to me.
...
Since NHSTA standards do not allow the rear brakes to lock before the fronts (it causes spins) brakes were designed to newver lock no mater what the load or distribution is. A driver, no luggage needs very little rear brake. 4 passengers and luggage needs LOTS of rear brake. It isn't very reliable to change the bias with varying load.

A few years ago, ABS equipped cars started to get "dynamic rear proportioning". Basically, the rear brakes are applied MUCH more than would be allowed without the ABS to kick in a prevent rear lock. This saves the front pads and works the rears. Those of us who don't hammer the brakes in heavy city traffic wear out rears before fronts. LA city traffic commuters will wear both sets more evenly. That's why you see so many rear pad replacements before fronts these days.