Considering that we don't know how any Star Wars tech works, I'm not sure how you decided it is unrealistic. What does FTL actually look like?
The Star Wars extended universe goes into loving detail on how most things work, believe me. Still none of the explanations, even if some individual things
do make sense do not make the whole thing not work holistically
if we assume it's the same universe as ours. If we have FTL, no matter how lovingly the concept of hyperspace is discussed and explained in other material, why aren't there the unavoidable time paradoxes? That makes it unrealistic from that particular perspective. Space craft fly in the vacuum as if they are WW2 aircraft flying in an atmosphere...cause it's cool, not realism. etc.
I did add in the original post that there are some elements of the films that do give it a semblence of realism - it has always felt like an organic vibrant universe with complexity that seems close to our own world. That was the thing that struck me as 6 year old watching it the first time. It wasn't a film with a small band of heroes in a sterile universe of space nazis. Sure it was cool what they could do: space-lasers! space ships! but everything felt lived-in, a bit broken...everything
felt a bit real. Of course you scratch a little below the surface and things go awry with regards to this. I was a very rational six year old. I had worked out Santa Claus by then and had also dismissed religion.
One must stake your position on realism somewhere. If humans ever become a proper space faring race, the reality I think will be vastly different to the Star Wars universe. And that's using technologies that I think will be made but I don't know how they will actually work.
However this perspective is one we tend to ditch when coming into this franchise, because as
@The Big Peat states, 'They're fun'! They are pantomine based on Flash Gordon, muscle cars and age old stories. Set in deep space. Realism ain't its thing; escapism, entertainment and spectacle are.
There is one explanation that makes it 'realistic' and still work in our universe. The whole Star Wars universe could be a simulation, so that the rules of it's worlds are re-written to allow space magic and all your cool tech. That'd work.