5.1 It would be great if refrigerators could be upgraded by only changing the door. The body of the refrigerator would only be an insulated cupboard and the cooling system would be housed in the door.
5.2 Adaptability: The refrigerator system can changed depending on your needs.
A modular system that can be extended by adding compartments. Compartment can be switched off so that is just a coolbox without active cooling, or they can be taken to a new location. (Mobile box for a party, sailing, pick nick…)
The system can be upgraded by changing the compartment that houses the cooling system.