Mine… My Xbox 360 slim only costed 129 euro back in 2012 and to this day still work like brand new, you would think that the disc drive would stop working but no. Never had the need of open it or clean it’s insides. Still great, I just don’t use it anymore since I feel it’s outdated and loading speeds are better nowadays.
That doesn’t mean that those fridges were simply discarded. They were probably refurbished and re-sold.
And what you described about being obsolete sounds like a fashion thing, not an engineering thing.