On a range, I can understand this, occassionally. But I've long been in the habit of NOT holstering an empty gun or a gun with an empty chamber. If the gun has to be unloaded in the holster, remove the magazine. Load when appropriate and then holster. When leaving the house with a CCW piece, I know that it's loaded without needing a press-check.
Do you want to rely on your memory, checking your gun before you holster it for the day is an extra bit of security, particular if you have multiple CCW guns for different types fo clothing.
Chamber indicators can break also.
In combat a press check makes no sense, but when you are putting a already loaded gun in it's holster it's a good idea to check before you head out IMO.