A ruined dinner or getting late to swimming are one time events. Teaching your kids that tantrums will "work" in all the wrong ways will affect your life for a long time.
So sometimes we eat burned dinner cuz someone was acting like an asshole. Sometimes play dates "fall through" because someone thought they'd obligate a parent to do something they hadn't even discussed. Good God nothing teaches like bad experiences, and my wife and I can maintain some shred of sanity. Actually that's not fair, our children are a joy ( and exhausting).
It's one thing for your teenager to sob because she didn't have any spending money for the surprise trip somewhere with great shopping because she blew all her money instead of saving it for a great opportunity. It's a completely other thing to have to learn that lesson as an adult.
It's hard enough even with that help. Kids have their own minds and personalities and methods of coping with a vast world they just don't understand and can be overwhelming. One-size-fits-all suggestions such as "never punish" just trivialize how complicated little human beings really are.
That makes children hugely instructive for how to deal with your colleagues. Understand that underneath the facade, everyone has that native wiring that kids lay bear. What kind of things do children respond well to? What do they pull away from? How do you bring the child back to your good side when they're upset?
While the incentives may become more complex with adults, the fundamentals and principles are the same, and children are a powerful lens into the human psyche.
I can only assume that the people constructing the advice have a nanny and/or a housekeeper.