Superman's heart problem in Superman and Lois

I have just finished watching the entire fourth season of *Superman and Lois*, and bear in mind, I'm in the UK, so we get it months after it originally airs. Now, as we all know, Superman was killed by Doomsday and had his heart replaced with that of a sixty-year-old man. Now, I absolutely loved the seasons—it's one of the best interpretations of Superman I’ve seen. For example, he wasn’t easily weakened by a bit of Kryptonite. As much as I love *Smallville’s* Clark, a small amount of Kryptonite would leave him so weak he could barely stand. Sorry, I digress.

In season 4 We’ve now learned that Superman cannot regenerate if it is removed completely and since his heart was removed he was left without an organ, and we are told that Kryptonian technology can't replace it, that’s where I have an issue. Let me explain: humans have successfully grown small organs on the backs of mice; if I recall correctly, they grew a human ear on one. Now, humanity is still light years away from growing complex organs like hearts or eyes, etc on mice but surely this should be within the realm of Kryptonian science. They could easily take a small sample of Clark’s blood and grow a new heart using their advanced technologies and then implant it into him.

Why? Kryptonians possess the knowledge of 28 known galaxies, which is said to encompass the knowledge of the universe. We’re talking about beings who can rip out someone’s soul and imprison it in the Phantom Zoneas Phanthoms or transfer a Kryptonian’s mind into a human body, granting them Kryptonian-like powers. Are we really expected to believe that the most advanced civilisation in the galaxy cannot create a new organ from Clark’s blood?

I understand that James Gunn doesn’t want conflicting versions of Superman, which is likely why they handled it this way. However, I think they could have approached it differently. Also, I don’t think they should recast Jonathan and Jordan. Even after 20 years, if they still looked the same, we could attribute it to their delayed human ageing since there are Kryptonians.

That said, these are just minor nitpicks. I enjoyed the season—definitely one of the best portrayals of Superman on screen.

Thoughts anyone, do you guys agree with me?