People assume that computers will do everything that humans do. Not good. People are different from each other and they are all really different from computers. ↗
And, of course, some SF is set close enough to here and now that Anglo and European do apply. Since many of the writers come from those backgrounds, so does much of the fiction. ↗
Some people must go to extremes to get the world in balance for themselves. Some can't bear bright lights, so wherever they go they search for the dark; they turn the lights down, anything to sustain some level of comfort. ↗
As for sticking strictly to presently known science, I will simply point out that we have already experienced at least two major revolutions in science in this century alone. ↗
I think the international appeal of SF is quite understandable since the kinds of people who like to read it, are, by the nature of the beast, interested in other cultures, of which other nations on Earth are the closest available example. ↗
Ideally, I'd like every issue to include a diverse group of stories that meet the qualifications sketched above, but covering a wide range of specific matter and flavour. ↗