The problem i have with it being like any of the combat that is inspired by the legendary M&B, lots of people don't "Get it." in the general population. People more understand an action combat approach. It also looks more pretty.
I played M&B in third person most of the time, being that well it's hard to see the whole arch of the swing of some weapons within the game. You need to hit people with the sharp bits to do real damage.
Pretty much if you do M&B combat do it right. But many games that have been made have done it horribly wrong I can only name like 2 that mimic and capture the complexities that are within M&B, the others streamline it too much and make it clunky.
Good games with M&B inspiration is, Chivalry, and Kingdom Come: Deliverance.
I have not played mordhau though looks promising.
But Honestly, I am more worried that the already niche game that this is, wouldn't benefit from such an alienating combat system. I think it needs to be more of your typical action game, But if they think they can pull it off and make it as good as mount and blade, and its games that it has inspired the better.
They already have a vision for their game though, and the type of combat they want, it's a combo based action combat system. Where you build combos and use techniques of various lands you may have traveled to.