[Terr_]

Hmmm, even if plans of that nature are not mandated to exist, I wonder if having a clear legal definition of them could help create a market anyway.

> including things like modifications to cabinets

Or perhaps require that the "plan" being purchased includes specs on min/max dimension and max weight.

> the price of the machine includes the cost of supplying the above service contract for 30 years

This seems like a recipe for bankruptcy though. For example, suppose Acme Appliances has a lot of customers, and then that country elects a crook as President who abruptly declared an (illegal?) import-tax (tariff) of one bajillion percent on all the spare parts.