You could give up some model churn, lowering actual costs by using the same parts in many model years. It's hard enough to maintain parts inventory in an automotive repair context, and there's just not enough money in the devices to sustain a similar level of complexity in appliance repair.

You could sacrifice some compactness, using interchangeable brackets and larger assemblies that connect together with fasteners instead of custom-molded brackets and glued-up assemblies that can only be assembled, never disassembled. These might be more expensive for a single model, but over several years economies of scale would catch up.

Finally, you could make these replacement parts available at home improvement stores and at the same retailers that sell the devices, instead of through distribution chains only usable by licensed professionals. I was able to repair my furnace this winter when the exhaust blower failed (and my AC when the capacitor failed) because I could buy the part I needed on Amazon with next-day shipping. I had the day off, and was willing to drive around, but on calling 12 different places within an hour I found none that would sell the parts to me. And just a visit for a quote would have cost more and taken more time than shipping the failed component from Amazon.

The manufacturers would prefer that you buy an entire new appliance from them, and have made decisions which harm the environment and harm consumers, but benefit them. Regulation is required.