Hmm. I don't think Scifi has to be be based on 'real' reality. Many of the great authors played with ideas that are definitely beyond the reality we currently perceive.
I do think, however, that their story has to be developed with an internal consistency which the thoughtful reader can pick up on and then be carried along with. The well crafted scifi story can feel 'real' despite containing the most outlandish disregard for scientific fact.
Even the name 'science fiction' indicates that the story is fiction about science. Otherwise it would be 'science fact', and more like an adventure using known science, which I think is pretty much a specialised genre of its own
Can scifi be looked on as superior to other genres? Of course it can, as superiority is a subjective assessment and for some individuals there is no doubt on this score.
With equal validity other genres have followers who can make the same claim.
I absolutely agree with the idea that there are special 'protocols' for the scifi genre which readers and authors alike assimilate over time. - just as there are special protocols which apply to the other genres.
How often do we say, 'Wow, that was a great book!' and have the person we're talking to say they just, 'couldn't get into it'. I think that is the protocol preference the person has developed.
Is scifi better than other genres?
Not really, but having read it for over 60 years (I pinched that line from James Gunn) I'll still say -
LONG LIVE SCIFI !!!