In reality, I'm a strong supporter of everything above. Maybe we can really provide people better jobs by delegating repetitive and boring things to machines and allow everyone to do something they enjoy to earn their lives.
One can dream, I guess...
Machines are anything but reliable. They need constant servicing and maintenance and still break entirely
When you are not budget constrained, and building things for businesses, a little overengineering goes a long way.
I have a Xerox 7500DN color laser printer next to me, and it's working for more than 20 years at this point. It has gone through a lot of spares, but most (if not all) issues are from parts wearing down naturally. Nothing breaks unexpectedly on that. Same for robots. Give enough design budget, overengineer a little, and that thing will be one hell of an ugly but reliable machinery.
When you work with real "industrial" stuff, the landscape is very different.
If you keep up the maintenance plan for machines they rarely break before their predicted retirement date when you replace them. And since the maintenance and retirement dates are predicted in advance you can plan for them and thus ensure they happen when you want them to.
There are options to deal with your shitty knees, hip, and back, but none of them get you back to 100% of your original capabilities and, carry an element of gambling, and will involve the kinds of painkillers that can ruin you far more comprehensively than a shitty joint will.