I just got a service call from a customer who had a programming question about an old robot. A REALLY old robot. it was almost ten years old when I installed it, used, over twenty years ago.
The robot still runs a 24 hour day, and has now been doing so for over thirty years. And aside from (Minimal) normal maintenance it is just ignored. And the new ones are built ten times as well, cost less, carry more, and still have a published reliability of 65,000 to 76,000 hours mean time between failure, and most dramatically exceed that.
Wish they made knees.