You can get expensive repairable appliances while last; Miele washing machines, for instance. You'll just pay for them. Most people don't want to pay over a thousand euro for a washing machine, so don't.

Usually not enough customers are willing to pay for it to make it worthwhile. If that many customers would pay for it, then it would be profitable for the company to make products that way, and companies would make it that way.

Customers don't have enough information to make an informed decision. I don't mind paying twice as much for something that will last a lot longer, but without a lot of research the price signal is the only indication of quality and more often than not it's just a premium for a well known brand rather than actual quality.

Indeed, that is the justification for planned obsolescence, the environment be damned.

Doing things that are unprofitable is also unsustainable on a large scale. It an only be done by using subsidies, i.e., other resources generated from profits, which does not scale.

Losing money is not a viable long term solution for a business, an economy, or mankind.

Accepting lower profit != accepting negative net profit and is far more sustainable for mankind than dogmatically seeking maximum profits.

> if customers would be willing to pay for it.

That condition resolves to false though ;). Most don't care and prefers to pay less.

Check anyone in a shop and ask him if he compares the internal components of both TV when he is shopping, he isn't...