In my case, a razor don't need to be made with the most noble material, but a material designed to withstand what it is made of!
Zamak is not made to get wet, it relies on plating. There is no advantage even to using zamak other than cost.
So when a razor is made at least in brass, that's already something that is worth for me.
@saj About your Fatip, looks like more a (another) quality issue.
I had already seen reports about both the thread and the pins coming loose from the cap. Seems to be a bad solder problem.