The guns I carry were all tested before they were carried, and are regularly fired at the range. I also dry-fire at home several times a week.
When I first got my CHL, a woman was in the class, proudly showing off her new Smith .38 ... she said she had never fired it and didn't even know how to load it. She said she thought she'd get that info in the class.
Needless to say, she failed the range portion of the test. However, the instructor worked with her for a bit and gave her a second chance. She barely passed. I'm guessing she never went to the range after getting her plastic. Best case, she got bored carrying and the gun is safely stashed in a closet. Worst case, there's a woman wandering around with a loaded gun and a license to carry it who is a menace every time she steps outside the house.
I know there are many folks here who believe the 2A is all the license you need to carry. I respectfully disagree. I don't want people with no clue wandering around legally armed. There are enough people with guns who don't have the legal right to own/carry them. If I'd been the instructor above, I would have flunked her immediately and told her she could come back, for free, after learning to use the gun.