Printing issues and potential shirt snag. No real benefit unless shooting competition where you are dropping the mag for reloads.
Printing: Your talking about a full sized frame 1911, right? Yeah, the little rubber foot is your biggest obstacle.
Shirt snag: Maybe. I've not had a problem.
I don't typically dump empty mags all over the ground, but then I'm not an action pistol competitor. However, that extra bit of something makes it easier to seat the mag with authority.
Admittedly, it's all very personal.
Here's my setup, you be the judge:
(FYI, I just tossed the flush fit OEM mag in for the pic)