Realistically speaking attempting to do an ROH would cause serious injury to the fool who would attempt it. IDK your background or if you have any experience in using large heavy tools but I do (ax to cut wood and sledge hammer for various tasks). Grab a sledge hammer and try to spin while doing a reverse over head with it as shown in game.
(I don’t recommend it) but once your out of the hospital tell me how it worked out for ya lol. as for being realistic i would then argue it has the title “medieval warfare” in it so i expect some level of realism with its combat performance and mechanics.
The maximum swing arch i described would not break the swing acceleration/deceleration as it would not effect the speed or manipulation of swing-in-motion. It would effect how far /long the swing could be active but only so much as to stop the extreme abuse of the poorly done animations.
In regard to swing acceleration and deceleration that too needs some work and refinement. Take a sledge hammer or a wood cutting ax and swing it from right to left as hard as you can. You will notice that attempting to manipulate the speed of the swing like in chivalry will only result in potential injury while simultaneously greatly reducing the effectiveness of weapon/tool.
If the ROH would still be possible with what I described then they need to set it so when a wind up is occurring, if something or someone is in the wind up animation model it will then be stopped like being hit during wind up and cause no damage to the player it collided with. This will then not allow the ROH and would greatly reduce the possibility for team damage especially when a teammate is right on someones back. Just another thought and again appreciate the feed back and discussions and love that you knew it was Newtons Law :)