But then in a real world you have a group of smart people who seriously argue that changing the human biology with various weird technologies would actually be a good thing and that we should totally work on reliable ways to increase longevity, intelligence and other abilities and remove any regulations that would stop it.

I think that's a pretty simplistic view. We want regulations that prevent Xrisk. We want resonable discussion about the merits of new technology and management of it's risks.

We don't have magic nanobots that make everything better without cost. That's the frame of fantasy. Debating new technology in that frame is unproductive.