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@clacke
"Okay, 2, 5".

And if you say "5 5, two fives" you've lost the efficiency argument.

Body language is ambiguous and not available over the phone, or if someone is paying attention to what they're putting into a form (digital or analog) while listening, and I think people are unlikely to switch modes.

I can see why you'd stick with it if it's what you learned, and it definitely improves flow when you're surrounded by people who did.