Earlier quoted context omitted.
That 2mm uses at least (2*335 + 2*235) * 2mm * 1mm = 2,280 mm^3 more material for the case. (a wall thickness of 1mm)
and less broken devices hitting landfill
How about all the energy waste for manufacture of what are "engineered" as effectively disposable components & assemblies in numerous facilities?
Also scattered local emissions, not only at the factories and delivery ships & trucks, but consumers kick up all kinds of exhaust and waste just earning the money to participate in such a scheme. And way more so for short-lived products that are the least bit overpriced compared to how they could be from the same factory.