You're confusing lifetime with warranty.

No appliance has ever had more than a 5 year warranty as far as I know. Most stuff at a big-box store is just 1 year. Even my "built like a panzer tank" Miele came with 3 years despite it being built to last 20, though I could pay to extend it to 5 years but I didn't see a point.

Warranty just covers things breaking from early failure or something not being put together at the factory correctly. It's not meant to cover the whole lifetime of the appliance.

Even the stuff you mentioned that lasted 15+ years didn't have more than a 3-5 year warranty, guaranteed. You can check yourself.

Like, Toyotas have a 100k mile warranty. Would you expect it to only last 100k miles?