1. Technology isn't alive. You can copy it, test it, break it, completely gut all the parts and rebuild it. Ethically you cannot do that with people and animals. And right now if it dies, it is dead you can't undead yet. Unlike technology, it dies you can bring it back to operational again.
And this one is the blocker for the really interesting research now, which is combating aging. This graph is in Norwegian but it should be pretty understandable, it's number of deaths by age for each sex and in total. If you look at age 1-17 it's almost zero. from 18-40 we get to make our own stupid choices but still very low, 40-60 people start to check out, 60-80 it's climbing rapidly and 80-100 almost everyone dies. If we were all as resilient as 20 year olds we could live 1000+ years, we're fighting disease in a more and more frail body. I'm not saying it's pointless but it will get exponentially harder and harder to improve.
The problem is though that nobody wants to experiment on healthy people that don't suffer from anything but aging, that you're in good shape for a 60yo but considerably worse than when you were 20yo is only natural. Beyond that you should eat healthy, exercise and all those other lifestyle choices we're not going to make any real medical effort to make you young again. Could we for example clone a new heart and give me a heart transplant, for no other reason than it got 50 years less wear and tear? Can we fix presbyopia that from Greek literally means "see like old man"? What about a way regain lost hearing, that almost everyone loses with age?
This is not how you would maintain a car, you don't wait for it to break down first before you start doing anything. Parts have life spans, parts need service, parts that start showing signs of wear and tear gets replaced. Humans? Don't fix it if it's not broke, in fact we often can't even fix it when it's broke. You're just supposed to accept that you're not a spring chicken anymore, half your body's systems are failing and doctors are running around with the proverbial duct tape. At some point we have to try experimenting on making healthy people even healthier, to rejuvenate them. We haven't really started yet and we certainly won't finish in my lifetime, nor in the lifetime of anyone I'm likely to meet.