It would seem that the heavier part (grip with a mag full of ammo) would gravitate downward, pointing the barrel upward.
A pointed down 1911 could be dropped when out of a holster, and dropped on the barrel end-from the firing hand 2-3 feet above the pavement, oops!
Anyone that only has their 1911 out of the holster over carpet, gravel, or dirt, might be a very low risk (of dropping on a hard surface) exception, or the owner that would never-ever drop a loaded handgun (sure, and you'll never grow old, either?).