I've long accepted that stainless isn't good for anchor chain, but then I frequently see stainless seizing wire used on anchor and mooring shackles. Isn't that wire prone to the same failure?Stainless really likes oxygen. It will eventually corrode if you use it as anchor chain. Being bunched up in a damp anchor locker along with wet nylon rode, etc is not good, when there are better choices.
I am almost certain that the welds in stainless chain are more brittle and will fail faster than galvinized.