You have a point BUT there’s a progression here.

First they’re going to be crappy emergency-only replacements that break down. And it’ll probably be like that for 10-20 years.

Then they’ll move into the “pretty good option” phase when things go wrong but you can choose between a few treatments. That’s another 10-20.

Then they’ll be in the “unfair advantage” stage where they outperform natural organs and disqualify competitors. 50 years.

And then they’ll be the “most people get them in their late teens or twenties” thing, like braces.