I suspect one major contributing reason the early modern period gets little representation in video games because it occupies the transition from edged and bladed weaponry to firearms, but with the latter still remaining fairly undeveloped and less engaging compared to modern weaponry. Reloading and preparing a matchlock firearm for a whole minute wouldn't be fun for most people. So you'd have more than double the work by having to not just implement both melee and gunpowder weapons but also have them synergize well while keeping it fun. Not impossible, but definitely requires more thought and effort put into it.