That should be totally up to the writer

As a reader of historical fiction, I do prefer the background info to be factual. However, a good work of fiction, is, well…fiction. that being said one can’t know all the details of characters personal lives and experiences - why it is ultimately fiction and those parts can’t be factual no matter how hard one tried.

I think the important part is not to decieve the reader. I also enjoy pure fiction as long as I know.

It should keep only some of the facts, the major, recognisable ones, but fictionalise all of the little details and incidents which we can no longer know happened anyway.

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I find it a little bit disturbing that in Turtledove’s books, he claims that green lizard aliens fought against both the Allies and Axis, when in fact no such aliens ever fought in WWII. He should have written those books more realistically.

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Personally, I prefer it to keep to the facts unless the story needs to deviate in order be coherent. Say, it’s a fiction about a soldier in WW1, then you shouldn’t write about how Lenin himself defeated the Germans at Verdun. What if it’s about a soviet boy in a world where, for some reason, the imperial powers looked favorably at the Soviet Union? Then by all means, tell me it’s because Lenin himself defeated the Germans at Verdun.

It should get the basic facts right at least, the details shouldn’t matter too much (unless they’re known & proven). Most importantly, it should be indicated which parts are purely fictitious