Well AC has something along the line of a Historically accurate setting or background while Kingdom Come: Deliverance claims actual historical accuracy.
I would rather have them stay true to that and perhaps publish another Kingdom Come game in another setting where armets and sallets with bevor were seen.
Something set during the Burgundian wars would be great since there is a lot of first hand documentation of it (think Philip de Commines) and sadly has been left out of video game or movie adaptations.
PS, I have a question for someone with a little more knowledge of Eastern Europe and specifically Bohemia Anno 1403: Were the Tartars still raiding and plundering Bohemia in 1403?