If you are looking for law enforcement training, competitions don't really offer that. They do not simulate pulling someone over for a seatbelt ticket while standing in the interview stance, and having to engage multiple perps from hard cover until back up arrives.
If you want to simulate getting robbed while taking money out of the atm machine than IDPA is for you. If you would like to find the limitations of you skill and your hardware while improving fundamental mechanics such as drawing from holster and shooting at multiple targets quickly than just about any action shooting sport will fill your needs.
I see no reason to make such a science out of it. Just try it or stick with the idea that comps = death in the street
John 20:29 Jesus said to him, “Thomas, because you have seen Me, you have believed. Blessed are those who have not seen and yet have believed.”