Any brass shows wear over time. I have some 45acp loaded 20x plus. You can barely read the head stamp & I never shoot max 45acp.I'm not sure what you mean by that? You mean there's no point in inspecting the case after firing a new load and looking for things such as the case being distorted or getting hammered on the head area?
For instance, I've picked up some 45 acp brass that was definitely loaded up pretty hot. The head stamp was pretty much smoothed out and the edges were rounded off. From what I gather that's from the round being slammed into the slide when fired and beating up the brass. Those cases were discarded but just something I noticed and researched. I haven't found any 9mm cases like that yet though.