I hadn't read about that artificial heart design before. I'm guessing it's going to turn out badly though. There's probably some unrecognized dependency on the pumping behavior in some part of the circulatory system. Like, maybe arteries will harden much more quickly if they aren't regularly stretched, or cells won't dump their waste as efficiently without the changes in pressure in the capillaries around them.

Interesting, I didn't realize it was debunked. Thanks!