It is one large pizza, 8 slices, that is 3 to 4 people.

Yes, some people can eat more or less. If you had 10 people, you could order 2 larges but that is going to be a treat or a snack, not something that will be welcome if that is a lunch meeting.

This is what I’m saying. “Between 2 and 10” is useless guidance.

I don’t think it is, at all. It’s telling you to keep teams small enough that you can manage them and have them all in one meeting

And secondly, do not need to fill out an elaborate expense report for buying lunch. At the time of two pizzas, Anazon circa 2008, that would have been a sub $50 order.