2 slices is considered to be a meal. Calorie wise, it likely is. Typical large pizza has 8 slices. The vagueness is intentional. From the Amazon concept, it is intended to replace a meal and not be a random snack. (Former amazon employee here)
Sure I'm not really getting into whether or not it's supposed to serve as your lunch and whether it's a healthy limit even if you'd like more^, etc. - I just mean it's meant with the assumption that people are having that much, not that it's your orders at a team outing to an Italian restaurant or something. (In which we agree.)
^personally I work from home and rarely eat lunch, so I have no skin in this!
Regional/cultural differences, appetite and body size, pizza styles, etc.
For small teams that makes for a meaningful difference between the min and max. For large teams not so much.
My wife and I have no issues finishing a 16in tavern style pizza. So that's a 4 person team. We're not even large people or big eaters. We just like pizza.
I hear you. I love that you can share a favorite food like that with your partner :)
When I worked for amzn.. I was eating approx 3500 calories a day - long bike commute. Pizza was always disappointing as rarely enough (and even then, eating my fill would be too much. I had to go out and still buy another lunch anyways* - and almost always not enough veg pizzas!). We perhaps could get into the variety of factors, yeah, eg: nutrition density to as a function of toppings.
Though.. if you look at serving size and how many people a large is meant to feed, it is pretty simply just 3 to 4.
* worse yet, because lunch was delivered, there was an expectation to work an extra hour that day (ie: working lunch meeting, and certainly do not go home early). Foing out to get enough real food and suddenly I was the bad guy for being the one team member not in office. Actually buying lunch was easier, I would just buy two at once.. Thinking back to that time, holy shit the work expectations were something else..