So, you could have shared if willing to pay $8.50 for the one pizza and not use a credit. Or, order two pizzas for $17 and share the flavors. OTOH, use a CD $15 credit and tell them hold the App and hold the Dessert. And then you cannot share unless the partner is ordering as well.
Pretty absurd it seems as they are saving food items (pennies I suppose). I guess they just don't want to see a couple end up with 4 free "meals". So, I see some logic in their thinking. It would be simpler perhaps if they just gave each person on Plus a $30 credit for Casual Dining. But that would be advantage guest and not Princess.
I think you are correct that 4 a la carte pizzas (2 per person) would be reasonable way to go. Or, 2 prix fix meals or 3 mains a la carte in Plus package. Even so, would still have the sharing issue.
I am just getting this more muddled, aren't I? It's just weird and I suppose the bigger issue is folks who get stiffed with nothing extra on a long voyage. I think I like my Standard Fare better. 😉
Seems like no way out for the light lunch diner other than to leave money on the table - or at least appear to on paper. If you can take away the extra slices to another location, I suppose you salvage some value for later (but no way to reheat the slices at another time).