Agreed. The reasons for this change are well known to me, having studied medieval history and being practicing medieval fencing (german school; langes Messer). The ups and downs of offensive and protective weapon technology is a quite intriguing matter for itself. Allthemore as this pattern even saw comebacks and many developments were not total. For example the re-emergence of cavalry lances in the late 17th and 18th century, or the fact that even around 1700 infantry (especially grenadiers) used steel cuirasses for siege operations, while such body armor was in general long neglected by firearm infantry (and even most pikemen). Then again, infantry body armor made a general comeback in more recent times with different materials and requirements.
Alas, I guess this is not the right thread for such causerie.