

There are current studies about growing entire organs in a lab environment using 3D printed scaffolding and stem cells harvested from the patient, so the final product is 100% compatible and eliminates the need for immunosuppressants.
Still a few decades out for human testing imo but they’d be the first in line.
If we figure that out, artificial blood (which is already making good progress) and finally a way to regenerate brain cells without causing massive brain tumors we can extend life considerably, probably closer to 200 years on extreme cases.
Or, at least, making it to 110 while still having a good quality of life, basically making 100 the new 60.
So the answer is because the US is trying to monopolize the compute market and can not be trusted as an ally any longer, so they keep funding their home-grown tech, even if the performance isn’t there yet, because they may not have another choice soon.
Europe needs to wake up and do the same.