Is it just that some people can't "suspend their belief" without an explainable-in-present-day backdrop?
Some of my most fun scifi stories are NOT explainable using current science.
just off the top of my head
"And He Built a Crooked House" by Heinlein
"Little Black Bag" Kornbluth
(both findable in one web search)
the Gateway series by Pohl
or basically anything with time travel or ftl.
The thing is - the real world can be BORING. With present-day physics and astronomy - we are alone in the universe with real difficulty escaping our planet, let alone our solar system, galaxy or more.
I think the answer to real-world physics and astronomy in science fiction is -- better character development :)