Okay ... Porsche door handles keep up for decades. Old ones are known for pitting, but it takes a long time. What do you do to your razors to destroy them in two years?
I shave with them, I rinse them off with running water, I carefully shake them dry. I don't drop them, I don't bang them against anything. I have softened water in the house. They aren't exposed to any kind of chemicals, cleaning or otherwise. I never over-tighten them. In other words, I treat them like they should be treated and I probably treat them more carefully than I need to.
I guess the point I'm making is that in the alloy head "lottery", if you will, I've had 2 bad draws in less than 2 years. Maybe I could buy 50 more alloy head razors and it wouldn't happen again but the worry and the doubt are still always going to be there. I know that I can be just as happy or happier with razors that don't have alloy heads and I know that I don't have to ever worry about them rotting or disintegrating during my life time so I'm just choosing to not subject myself to potential problems since I can easily avoid it. I'm done with alloys with the one exception of the one I already own which is most likely going to be sold anyway because I have more razors right now than I really want or need.
Of course, this is just one man's opinion. A lot of people have alloy head razors and like them a lot. Enjoy them! (While you can...)