You make some good points. I think you are even too sanguine about Einstein. In terms of bringing people back, even if they extraordinary, it still might not be worth it. For example, Archimedes was undoubtedly brilliant. However, if you were able to bring him back now, I think it would take years if not decades to try to catch up with the learning before he was able to contribute to solving modern problems. In addition, chances are that by the time humans are able to bring people back, they would have made great strides in using genetics to make people smarter. Perhaps in the world where bringing people back is possible, Einstein is at best average.

One thing that cryogenically preserved people might be good for however, is as a ready source of organs for transplants. Likely the cryogenic company has info on the blood group, etc of the people that are cryogenically preserved and if someone needs an organ, they will be able to find a suitable “donor” for them.