Tony Vargas
Legend
One thought I had when considering a high-magic 3e campaign was that if magic, and thus attacks vs Touch AC, was fairly common, armor might go out of favor or have to find a way to stay relevant. I created a new armor or two, the one I remember was a 'Curaise' that was (like it's gunpowder era namesake) a heavier Breastplate, made with alchemical elements, it was more encumbering than a normal for the same AC, but spells and incorporeal creatures didn't go right through it like it wasn't there, so it added to your Touch AC for those purposes.Spells would be a major factor, though, and I could see how just one fireball per day would totally change the nature of battle. That's a whole different conversation, though, and more akin to "What would things look like if it took the same amount of time to master a cannon as to become a surgeon?"
I never actually ran that campaign, but the idea's been sitting there in the back of my mind.