Interesting stuff.
I don't have anything particularly brilliant to add, but it is noteworthy that on every car I've ever owned with 4 wheel disc brakes, the rears were always the first to go.
Pads, rotors, seized calipers, whatever. Always the rears.
On cars with drums in the back, no issues.
In fact, my 17 year old Nissan Pathfinder with 315,000 Kms on it, is still running with the original drums and shoes.
I've never had to replace them, ever, and yes, I check once a year. Even the e-brake still works.
I'll be very interested to see what happens with my new car a few years down the line.
Cheers everyone.