I am assuming a typical 11th century Norman knight wearing clothes, a gambeson, a hauberk, a Norman helmet, a coif, a shield, a sword, a spear and a water bottle.
now for the mass.
here I foud a chainmail+chain coif
http://www.medieval-market.com/goods.php?kategoria=10&kat2=Armament
which weighs in the ballpark of 12 kg... people were short so let's be nice and say 10 kg.
this is the first gambeson I found
http://www.medievalshoppe.com.au/buckle-up-black-gambeson-small/
http://www.medievalshoppe.com.au/green-arming-cap-medieval-padded-coif/
it's 2,4+0,25 for the arming cap. I round it to 2,5 kg
here I found a norman helmet
http://www.anvilfire.com/21centbs/armor/NormanHelmet/helmet.html
sadly the writer does not know English. instead of giving the weight he mutters some weird gibberish. 4 lbs 14 oz? well, I say 2 kilo and be done with it
they also wore some clothing.
according to this site modern boots weigh 1000 to 1400 gram
https://shopozz.com/en/weight#tab-2
assuming dark age boots wore about the same and the soldier wanted a pair of trousers as well as gloves and maybe some other accessorizes we can safely say they wore abut 3 kg of clothes.
this would give me an estimate of 17,5 kg for the armour.
now for the shield. they used a kite shield. according to this site:
http://www.mercwars.com/shieldtypes.shtml
it weighs about 4 kg.
the sword
https://en.wikipedia.org/wiki/Knightly_sword
http://www.albion-swords.com/swords/albion/nextgen/sword-norman-senlac-xas.htm
two sources say 1,1 kg. 1 kilo it is.
I can't find anything about the weight of a lance. therfore I link the a wooden bean
https://www.gamma.nl/assortiment/bouwhout-vuren-ruw-50x75-mm-270-cm/p/B339374
it is 5*7,5*270 cm and weighs 4,6 km. since a lance might be a bit thinner I say 4 kg.
1liter of water weighs 1 kg
so we get about 10 kg of equipment. with the armour that is about 27,5 kg.
now I would ask you to read this
http://www.popularmechanics.com/culture/a6749/medieval-knights-on-a-treadmill-put-historical-myths-to-the-test/
it states that because the armour is distributed all over the body, including he arms and legs, it is actually more tiring to move in.
furthermore most battles were held in summer when it was about 20 degrees celcius or 298K. this means that the padding isolates quite well. if you don't believe me try walking around with thick winter coat in the summer
.
I do have to admit that it does breath though... that comment was a bit shortsighted. still, the fights themselves were rather short.
now to the game. I think the maneuvering is essential and should be improved upon by better terrain (no more ridiculous hills please especially around the northern beach). I do not believe this should be on the campaign map. it is all about getting your army in the optimal position to crush the opponent. this is already sort of in warband if you stop your troops from moving but I find it feel a bit on the clumsy side.
personally I think stamina could be a worthy addition but it is really hard to balance. it should not be to obvious and it should not have to much influence. it should only be a minor debuff which could maybe start to appear after more than a minute of continuous combat and should be relieved by resting.
EDIT:
Rongar said:
For M&B they definitely were reading suggestions. And I believe that they implemented those of them that were reasonable in sense effort-result.
But since that I don't think they need to read new suggestion because amount of suggestion that were made in time of M&B betas enough for 4-5 games. And frankly, I don't see really new suggestions.
then why haven't they already implemented the option to switch out troops