I’m sorry, but I think your understanding of the advent of firearms is off by two hundred years or so. A few examples of early use does not constitute evidence that they were widely used or that armor was initially a response to them. Their design and use was limited. Gunpowder was not readily available. Crossbows we’re still the preferred ranged weapon of Conquistadors through most of the 16th century. Gunpowder use prior to the 15th century would have been unreliable and usually uncompetitive with bows unless conditions were ideal. There just isn’t anywhere enough evidence to support your position. From 1000-1400 AD the chances of being killed on a European by a gunpowder weapon versus edged weapons or bows would have been minute.