I guess in my mind that's like saying you want to write a story set in a pre-World War II era, be about things that lead up to war but don't want to worry about facts or reality and just do your own thing.
An era that is part of reality. The endless attempts to treat that and the continuity of a fantasy world as equivalent are non-starters.
And BTW, there are stories written and set in every real time period of history that take liberties with the actual history, culture and technologies of the times. Has no bearing on whether they're good or not.
This is going to continue (heh) to be a game of Creators - 1, Continuity Freaks - 0.