first off I wouldnt want the combat to be exactly like native as I could simply go and play native if I want.
The movement speed is actually pretty cool, at least I get the feeling to be in a hurry when we move out together.
Unfortunately it causes the fights to be rather chaotic but I guess its a battle so it has to be chaotic.
So I would like to see devs doing their own thing and create a unique combat system that stays true to the time and the scenarios
but maybe stamina is a good idea, I have always been a fan of stamina in Brytenwalda as it would increase the difficulty and skill needed to fight your enemy
which on the other hand would make a lot of sense.
If you are running / sprinting and then you'd have to fight somebody it would be very exhausting. So I wouldnt necessarily say reduce the movement speed but may be come up with stamina in MP just like it was in Brytenwalda.