I mean for software we talk about reproducability and versions down to the bit. But if a consumer products replaces one piece of metal with plastic it's apparently the same product?

Products should have versions that look like this.

2.1

* Replaces piece X with plastic. * Reduced frame width to save material costs.

This could also be positive and make it more transparent.

2.2

* Strength part X that breaks very often. * Change edges to reduce chance of injury.

I mean this opens a huge box of problems, I know apple didn't want to admit their keyboard was problematic in fear of lawsuits. This is how it should be.