Well blunt damage is caused by your body suddenly accelerating.
While falling damage is caused by your body suddenly decelerating.
blunt damage is when a giant ogre hits your head with a concrete sledge hammer and falling damage is when you hit the hammer with your head? well, i don't think that this is the problem. the real problem is the sound. if a sledge hammer and a dwarf approach but there is no sound which can be heard, was the dwarf hit? you see. the higher the volume of the sound, the higher the damage
i can't help but imagine a dwarf who lost both arms and a leg, no problem, just a flesh wound, jumping on one leg toward the ogre trying to bite it to death but hitting the hammer instead
well, falling damage is caused by the organs ripping apart, snatching off from arteries and stuff since they would prefer to keep falling even when the body already hit the ground. Muscles, Bones and stuff keep softer tissue in place, organs keep falling, compressing the softer tissue and at some point stuff rips apart from the top. the heavier you are, the faster you fall, the higher the energy of your organs pushing down when your body already stopped. that means... that heavy armor should rather increase the damage? it might make broken bones less likely but increase the chance that organs splatter and joints snatch, so loosing limbs is realistic? where am i wrong?
i can't see that leather cloathing helps much against fall damage. it helps to make scratches from rolling over the road and such less likely. the additional weight of the helmet is a problem. some helmets with heads inside are found at some distance to the rest of the body. additional weight increases the energy so if the body hits a pole the helmet helps the head to free itself from the necks chains. and if the head hits some obstacle... a modern helmet keeps the brain inside, that's not the problem... ...the skull crushes anyway.
well, is it implemented that - for humans - 0.5 metres are more dangerous than 2-5 metres? insurances often are afraid of smaller accidents at home, falls from 0.5 metres are more dangerous and are rather deadly, lead to severe disability and higher costs for nursery and stuff... since in such a short distance the body hasn't the time to bring itself in a proper position to compensate the impact. when falling from higher heights there is more time for that. when it is even higher it is just useless anyway.