....A few thoughts..
I think we have to consider a sword's effectiveness by the 'damage' it can do. The evolution of weapons would be dictated by this. Also understanding the swords primary function ie cut or thrust also gives clues to the 'style' in which it was used and whether it was effective against opponents....for instance the British Government favoured the thrust in the late 19th C but a number of their adversaries prefered the 'cut' ....Indian Tulwars springs to mind.
I would think that the thrust would be an easier technique to master and any 'deep' stab wound would at least debilitate your enemy. The slash would require more skill, would be aimed at specific areas of the body but would be easier to 'parry'.
I also feel, that although 'gruesome', understanding the injuries (fatal or otherwise) received in battle gives us an insight into the world of the individuals that once wielded the swords. A sword fight is 'upclose' and 'personal' and I often wonder about the thoughts of those, standing on the battlefield , waiting for the order to attack .....
especially if they were the second wave ...with their comrades laying, dead or dying on the 'field'.
The symbolism of the sword was 'annointed' with blood ....and wielded with courage....without fully understanding the gruesome-ness ...we cannot fully appreciate that courage.
Regards David