Good post, good points. It reminds me of those early modern depictions of classical antiquity, where people are dressed like tercios, https://en.m.wikipedia.org/wiki/File:HumiliationValerianusHolbein.jpg

Perhaps most depictions of the past tend to be anachronistic because we are too immersed in the super structure we are part of that we become unable to imagine anything different.

Then again this fantasy worlds and games created under capitalism have every incentive to do the bare minimum and just copy each other without any nuance or research. It's also likely that a truly accurate world would not resonate with audiences.

And indeed the half assed fantasies reinforce the prejudices of their consumer.