And would be fairly inaccessible to many viewers today. That's why TNG's elitism always rubbed me the wrong way, as did Gene Roddenberry's view on future humanity as shown in TNG.
There is realistic, but there is also crafting entertainment, and TNG's elitist snobbery of evolved humanity isn't entertaining. There's a fine balance to be struck, and I don't know if Star Trek ever fully achieved it. TOS was close to it, since it allowed imperfections in humanity (Styles, Kodos, Mudd), while encouraging collaboration among the crew. Obviously, very much a product of the time so certainly not perfect.
I think that looking at Star Trek to portray realistic future humanity is incredibly difficult, since imagining what future humanity might be like is quite difficult, much like humans imagining us now, 300 years before. And we are trying to tell stories that are relatable to current humans, so presenting them as completely unrelatable is a failure of storytelling.