FB and others, this talk reminded me of an incident well over 20 years ago when I was helping my sister organize a move with hired movers involved.

One of the burly guys grabbed her bike to turn the stem to put in the truck, and I said, just a second, I'll grab the allen key to loosen the stem for you.
Burly, thick as a bucket of nails guy just says, "oh no, no need, I always just grab and bars and twist them really, really hard"

I put on my best diplomatic face, and not wanting big burly guy to get offended and perhaps be rough with other stuff he was packing, so I said, oh I have it right here, did it myself, and that was that.
So be aware of burly movers and your beloved bike handlebars.

re "racing tight" , I'm glad to have read that here years ago, and keep it in mind the few times I put on shifters or whatever. Only once have I benefited from only tightening "racing tight" with a small crash, but appreciate having learned about it.