CZ’s argument in favor of the decocker may in fact apply to most shooters, but certainly does not apply to Front Sight students, who generally do have the necessary skill to carry cocked and locked after one or two classes. As Col. Jeff Cooper said, the decocker is a solution in search of a problem. There may be other reasons to opt for a Sig or CZ using decocker, for example reliability, which may be why 1911 fans like me at Front Sight practice malfunction clearances so much.
The vast majority of us don’t have the experience of shooting the tens of thousands of rounds necessary to train ourselves to almost subconsciously flip down the safety lever before taking the first shot, nor do we all have the opportunity to fit the weekly range sessions required to keep current with skills we have developed in the past into our schedules today. For plinking or casual target shooting, this isn’t a big deal, but when under the stress of a defensive situation, remembering to take the safety off is critical.
Source: CZ-USA Safety or Decocker – CZ-USA