OK, I know eventually my dex bonus from not wearing any armor will surpass what I get from actually having armor. For right now I have +5 mithral breastplate and chain both available to me. Aside from the differences in spell failure, since I end up at the same exact end AC, is there any other reason to wear one over the other? I'm confused why they would both let me arrive at the same AC when both are capping my dex at their perspective values. That seems weird. I would think a breastplate would at least give me one more AC over chain after the dex (capped) is added in.