So someone else is going to walk up to me, reach for my appendix rig and pull the trigger? One reason I like appendix or 3 clock carry is due to easier weapon retention. I have a bad right shoulder and have a hard time reaching around behind me. Add in that trying to retain a weapon against someone trying to pull-up against me?

And if your thumb safety and grip safety don't work on your 1911, you shouldn't be carrying it. Every time you clean your firearm you should be doing a functions check, which includes safety. So that wouldn't be your gunsmith letting you down, that would be YOU letting yourself down.