Not to argue.....At all, Just to expand the topic......
At a service/field level, I don't see many issues from GM's Delphi or Bosch connectors that are missing their CPA component. (Other than the "Lever Locks" on Modules & larger Gang Connectors)
Where some Chrysler connectors will NOT lock at all without the CPA lock being engaged. Get some sand/dirt/debris involved with a brittle connector close to a heat source & you can have a mess on your hands real fast.
First thing I do is.....Blow all the debris I can from around the connector, Spray it down with brake clean & blow it off again. Push the connector further-in while carefully pushing on the lock with a Awl or Pocket flat blade.