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I'd also push back that "extrapolated from real science" does not automatically mean "realistic" as in realistically achievable for our time period.

Rendezvous with Rama is both firmly based in extrapolations for the technology of the time it was written (1973) for the human technology, but vastly less so for the technology of Rama which largely goes unexplained due to the short time that the humans have to try and figure it out. The alien technology is vastly beyond that of humanity from what we see of it, but not so far that it feels out of the realm of possibility within our universe.

 A Town Called Malus wrote:
I'd also push back that "extrapolated from real science" does not automatically mean "realistic" as in realistically achievable for our time period.

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This sums up my stance pretty well. For example sorcerers casting spells using energy from a realm of dreams, real gods and daemons puts WH40K in stark contrast to works of Lem, Clarke or Assimov.

I fully agree that for a huge range of works lines may be incredibly blurry here. For me, personally, they are not in the case of WH40K, though.