This is why I come to HN..to find articles like this. This defies what you learn at school, because I have been taught numerous times, to nod and stfu when you're holding a convo. Always interrupt if you have something constructive to say in a casual/business conversation (unless you're in a debate), that's how you gain trust and credibility.
This is dangerous advice. Being perceived as someone who frequently interrupts is socially detrimental. As another commenter said, save it for when someone really makes it necessary, and converse with grace at all other times.