[DanBC]

You're talking about people who know what they're doing, using correct hot air rework tools.

I'm talking about people who don't know what they're doing using paint-stripper style hot air guns.

I have seen faulty PCBs caused by people using that style of hot air gun to rework devices. I used to have photographs but don't have them any longer, but there should be photos in some of the "soldering problems" engineering books.