Now, let's say a S&W owner, used to their looser standards of cylinder lockup, buys a Colt. He goes and shoots it a bit, and the hand (which probably has a bit of wear already, as he bought it used) is approaching the normal replacement interval. He checks his gun, and finds that the cylinder has just the slightest amount of movement when the trigger is back, and half of his S&W's longitudinal travel. Heck, he thinks, it's still a lot tighter than his Smith so it must be fine to keep shooting it.
WRONG! It's at this point that he should stop shooting, and take it to an experienced Colt gunsmith to have the action adjusted. Of course, he doesn't do this - he keeps shooting. The cylinder beats harder against the frame, compresses the ratchet (ejector), causing the hand to wear even faster, and the combination of the two leads to a worn bolt. If left unchecked, the worn bolt can do damage to the rebound lever. When it finally starts spitting lead and misfiring, he takes it in and finds to his astonishment that he's facing a $400 (or more!) repair bill, and perhaps a 6 month wait to find a new ratchet.
Of course, he'll now fire up his computer and declare to anyone who will listen that Colts are "delicate" and "go out of time easily" and are "hard to get parts for." That, folks, appears to be the true origin of these fallacies.