I think it must have a lot to do with the water. I have two Futurs and two Progress razors that are more than 5 years old, and show no evidence of corrosion, but I have seen other Futur razors that were starting to fail.
We have very soft water in Portland, and I don't any special care with my razors other than to rinse them in hot water after shaving. I don't take them apart between blade changes. FWIW, I use mostly Cella and MWF soaps.
Do you have a link-pictures to these "failing Futurs" and or Progresses?
Or anyone else? A link or pictures please of "failing Futurs and or Progresses.