I bought a new furnace last fall to replace the one that was installed when this house was built in the mid 50's. Yeah, it was that old and yeah, it still worked. I replaced it "just in case," and to save on natural gas. (With higher price of gas last year, I couldn't tell the difference!). The new furnace is nice. It's smaller and uses electronic ignition rather than a pilot light. The fan is stronger so the house is more evenly heated. But... it only has a 10 year warranty.
I'm still not sure if it was the wisest thing to replace the furnace that ran without trouble for 60 years with one that's guaranteed to do so for only 10 years.
Is that what they call quality controlled? Controlled to last a much shorter period of time than it could and should last?
Your refrigerator, your kitchen range, your slow cooker, your TV, your iron... they're all designed to fail within a certain period of time.
It used to be a matter of pride to manufacture a furnace or a washing machine that didn't need repairs. Pride? What's that? Now it comes when the company turns a profit, meaning they sold a lot of products. The more the better, so they manufacture them to become obsolete or to break down irreparably within a few years so people will have to buy new ones.
Such is "progress."