Exactly. We have a total of two mass shootings where magazine capacity had *any* relevance. One guy got jumped while "reloading"--but since his second magazine was damaged and wouldn't feed that's not really of much relevance--from a practical standpoint he was out of ammo. If he had smaller mags that might actually have increased the death toll because a dinged mag would have removed less of his ammo.

The second is the Las Vegas case--and in that case he had a ton of guns, mostly he was switching guns rather than reloading.

Detachable or not is the only meaningful distinction.