It shouldn't because (I believe) m&b's/crpg's most defining, unique, and entertaining quality is its simulation of medieval combat, including asymmetries of playstyles and load-outs. These styles are still ultimately up to the player to choose, representing different self-chosen levels of difficulty, potentially being better or worse in wider economic contexts (gold gain/upkeep/strategus), or having potential for teamwork despite individual weakness.
Is this thread only for those who support your opinion?
I support and back that statement - because it's exactly the thing that got me into Mount & Blade.
The wide range of potential playstyles and loadouts is one of the games' unique concepts.
Balancing heavy, medium and light armour so hard, that they are almost equal ony every level, like the "plate should only allow to take 1 - 2 more blows concept, would make the gameplay become very, very stale and boring in my opinion.
Completely killing variety and differences just for the sake of balance is way too extreme, and already turned too many games into games with ONE faction, and several different looks for it.
Heavy armour doesn't give too much of an advantage in my opinion - the more skilled player will always be the victor, no matter the equipment. Look at all the tincans getting mowed down by people wearing light armour, skilled people. It's not a free ticket to a good score, it's a style, design, way to play and represent yourself on the battlefield.
If we follow the route Vodner suggests, we would end up with hundreds of items and loadouts to use, which all of almost exactly the same stats and strengths, except maybe 1 - 2 points difference in something.
Sorry, that's not what I want.