Wow, first Grudge, chill a bit, you be comin' in swinging in all directions and it doesn't make for a useful discussion. Additionally usually if you're proposing a change and actually want people's opinions (not sure you do) a poll is nice.
From my experience, talking about "is movement too fast" is a bit of too broad a statement. A person in leather with a dagger should move fast in combat but also be cleaved in half by getting caught by a wide 2-handed swing at full power. A person in full plate, probably shouldn't. Rather than doing a big base movement change, I think tweaking the movement related to armor/weapon gear weight is the way to go. That way being lightly armored allows for things like scouts etc, but in a throw down duel between two knights or in big battles where people need survivability, people will be moving more slowly.
Another thing to tweak is the stamina drain for sprinting. Again, full heavy armor should drain stamina like mad if you run. You should be able to close the gap quickly even in full plate by sprinting, but it should be a sacrifice in terms of stamina. Haven't tested this current iteration heavily, but in the past you could run circles around someone in all heavy armor and have stamina to spare, which did lead to circling and wild sprinting a lot which, whether or not it's effective, doesn't make for immersive fights.
SV and Henrik have shown that they first and foremost want systems that feel immersive and "realistic" (within the fantasy setting) as long as they are also fun, so that seems to me like the balance that should be aimed for.