The actual sales person in the store quoted those lifespan estimates. They offer warranty plans up to five years for a few hundred dollars. I agree with you however, I wish they would last 20 years with minimal upkeep and maintenance!
The appliance store I visited was Albert Lee…they have several locations in the Seattle metro area, and have a good showroom with stuff from the middle price ranges up to the very very nice Gaggenau, Wolf-Sub-Zero, Viking, etc… they have smart sales people with no-BS attitudes.