I really don't like that advice. As much as I'm sure we're all guilty of trying to coax an insect onto a slightly different twig or something, you should always be aiming for minimum disruption. Just because you can pick up insects and take them with you it doesn't mean it should be encouraged any more than you'd encourage someone to pick up a fox and set up a shot in the back garden with it, regardless of whether you're returning it afterwards or not...
......