You can’t swing a dead cat without hitting a firearms “expert” upside the head. Almost all are opinionated and seem to think their way is the only way. Even training from a LEO isn’t a sure thing, either. I know LEOs who only fire their weapon periodically to maintain qualification. If anyone is intent on carrying, concealed or openly, seek out a street fighter… someone who has mastered the techniques of staying alive using a handgun. But they are rare.. and often expensive and involves travel on your part. Check references, too.
I disagree with “Myth ” 1. Maybe not entirely, because we always should be intimately familiar with the handgun we choose to carry to the point operation is instinctive and has no need of thinking about it at a critical time. But I do have more than one handgun that I carry, depending upon how I’m dressed and where I may be going. I want to maintain concealability. That also means different carry arrangements. But they are striker-fired weapons that have a lot of commonality between them and no obvious safety to fiddle with.