The reason for entering into this discussion in the first place was because it seemed like a premature failure to me.
I've been driving for over 30 years and never had to replace a water pump in any vehicle, including my wifes, or any of my three kids cars.
I have had a water pump failure, actually two, on a large industrial diesel. We installed a coolant filter on it and it solved the problem.
Owning a small business we have trucks/engines varying in age from model year '48, '62, '45, more than a dozen total, not including my personal autos and other than the one listed engine all have original water pumps.
I am sorry if I offended the Dex lovers, but in my world you have had a premature failure. I have not ever owned a car or piece of equipment with Dex installed, but i wouldn't say that I am anti-Dex. GM took care of that with me many years ago, as I will never own another one.
I am fully aware that a water pump can fail due to faulty installation, debris in coolant, or normal wear, not necessarily in that order.