[Zababa]

Focusing on the pizza box seems to be the wrong way of looking at the problem. Since we have insulated bags, pizzas don't spend too much time with the pizza box being the only thing standing between the pizza and the outside. What about making the insulated bag some kind of "keep warm oven" that can keep the pizza warm and control moisture? Make the pizza boxes that can still stack in that over but are way more open, use lots of fans to make the air circulate. This way the cost of the individual pizza box doesn't change, but you can still have a better product.

[cwillu]

Literally the standard dominos arrangement for decades: vented boxes with insulated and heated bag that isn't sealed.