It's more economical to recycle the metal parts and built new appliances than to reuse existing bodies. There is no technical uniformity in refrigerator designs, so retrofitting each one becomes bespoke engineering rather than simple assembly. Costs would skyrocket.
It would probably be more efficient (from an economic as well as an environmental standpoint) to force manufacturers to design appliances that can be fully disassembled and recycled with a minimum of effort (in terms of labour and energy). That way the raw materials used stay in use with minimal loss, and buying a new one won't be a waste at all.
Not necessarily. In my own case, if I had known, I'd have hacked my now dead fridge. The new ones are below it in every department. The market can aim at stupid if it provides sales and profit; while old models were designed to be actually useful.
We even asked with a two doors large fridge was the same price as vertical-stack slightly thinner one, the salesman ended up admitting that it was because it's designed to be more practical (better volumes).
It would probably be more efficient (from an economic as well as an environmental standpoint) to force manufacturers to design appliances that can be fully disassembled and recycled with a minimum of effort (in terms of labour and energy). That way the raw materials used stay in use with minimal loss, and buying a new one won't be a waste at all.