Meh, depends on how you approach them.I don't see the relevance. Haven't we already decided that shooting competitions does nothing to prepare someone for a real life situation.
I shoot USPSA (when I can) with my carry gear. Same belt I wear all the time, IWB holster, same gun, etc. The only thing I do is add mag holders to the waistband to comply with rules. You can practice essential things.
No it's not a full on simulation for a real world gun fight but I don't think anyone is professing it to be.