Jaster Mereel
Your average two-handed sword, unless you're talking about monstrous processional swords, only weighs between 2-4 pounds. Not heavy at all.
a gun is even easier - and lighterYea, but anyone can learn to use them.
machine guns tend to greatly reduce the ability for chivalry, what to speak of the options a veteran has at their disposal during a high altitude aerial bombing attack - hence modern warfare is essentialy about resupply (I remember talking to one anti tank machine gunner who was trained to understand that in a combat situation he would have 15 seconds to be "active")Resupply of personnel to the front, where the killing takes place. You know, the main focus of warfare?