Yeah, in the 15-16'th centuries there was also some special multi layer breastplates that can stop even musket ball and so on.
If you have to confront some well armored knight, you must always aim for the joints, visor holes and other weak points. In that way actual speed and accuracy effect better than just brute force.
I have sometimes thought that why medieval warriors never used similar nets what roman Retiarius gladiators had about 1000 years earlier. Few unarmed peasant can win full armored knight just throwing a net over him and then just sit upon, when the guy is rolling tangled on the ground.
Tricks like that were maybe against they code of honor or someting like that...