Plastic coated metal is still metal, the substrate bare;y covers the mesh and it’s too easy for their toes to get stuck in and will still create pressure points on their feet. Obviously it’s not going to make them drop dead but it isn’t ideal in my opinion. I know lots of people do this, especially commercial breeders, but just because we can doesn’t mean we should and just because people have been doing things a certain way for decades doesn’t mean it’s right. You do you and I’ll just try to pretend you don’t exist.