And the ones who do perform historical combat usually do so with blunt swords and modern protective gear instead of the real thing (though this is justified as fighting with real weapons would lead to unnecessary loss of life), so the mindset of those who spar in modern times is different to the mindset of the real historical soldiers who were put in actual life-or-death scenarios.
Also, many of these people tend to overlook ranged weapons. (While yes, the shields and armor of those times greatly raise your chances of survival, you are still not invulnerable and can still get killed if unlucky or facing a skilled enough fighter.)
And the ones who do perform historical combat usually do so with blunt swords and modern protective gear instead of the real thing (though this is justified as fighting with real weapons would lead to unnecessary loss of life), so the mindset of those who spar in modern times is different to the mindset of the real historical soldiers who were put in actual life-or-death scenarios.
Also, many of these people tend to overlook ranged weapons. (While yes, the shields and armor of those times greatly raise your chances of survival, you are still not invulnerable and can still get killed if unlucky or facing a skilled enough fighter.)
Some video examples: Pilum vs shield, English Longbow vs Agincourt-Era French Armor, Bow vs Armor Part 2