I'm thinking that if I wouldn't notice, I don't really care. No one ever promised us "real metal" on every bag. It's not really different than the coated canvas bags in place of leather...its a choice we make.
True it's a choice but if you don't realize that is what is it, then not much of a choice? Usually the care cards with the purses explain whether it's coated canvas or leather, fabric etc..
The discoloration on my feet of my bag leaves me where i will avoid it in future.