If you can get the whole world to buy a new fridge at the same time you would be so insanely rich anyone would fund that. Instead of the reality where people buy it on a year to year basis and then eventually need to be replaced on a staggered schedule?

It seems you're having a misconception that long lasting appliances means they are invincible or something like that. In the real world it means they don't go bad by time and usage.

Think of it like an old car. You can use your old car for a very long time given that you do your maintenance properly. They are also repairable. Yet these new modern cars can become unusable because some microchip burned, or battery life ended or there was a shortcircuit etc... Same goes for the appliances.

Making a product to last long with proper maintenance and a making a product to fail after certain years of usage are very different ways go about business.

Lastly, one company cannot satisfy the whole market. No matter what there will be people buying their products because of their long lasting legacy.