That's just it, they are not theoretical combinations for many, you only chose to make them so. Many's the time we've had Cosmic Rays Combo plate or Le Cellier Filet for lunch while in the parks and PM steak, Narcoossee's Surf & Turf, WPE Chicken or WPCafe for dinner.
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It appears to me you've made up your mind there is only one answer and there's no way a reasonable person could decide to get the dining plan.
If that's what you think I'm saying, then you haven't read my posts. First off, I don't lump the dining plans together. Each plan has a different analysis. And I routinely recommend the different plans for different people, depending on their preferences.
Even the QSDP -- which I don't personally like -- In this thread, I've listed the conditions under which the qsdp is still a good value. (Particularly if you love the soda mugs) And I've also pointed out that even without savings, many people may still like the "pre-paid" aspect.
So no, I've never ever suggested that "one size fits all."
For illustration purposes, for general analysis, I do like to use realistic examples. Looking at your list above -- Narcoose's surf and turf and Les Cellier? They have absolutely nothing to do with an analysis of the qsdp.
Pepper Market -- Sure, if you are staying at Coronado Springs, then taking meals at Pepper Market into account would indeed be wise. But for people staying anywhere else -- it is not realistic or common for people to go out of their way to get to Coronado Springs, just to eat quick service. With roundtrip Disney transportation, why would you spend over an hour in transportation just to eat a qs meal? (And if you have your own car, then you can eat for much much better value off property).
The Cosmic Rays Combo Plate? Sure, of course some people will order it. But if looking at a general analysis of the qsdp -- with over 100 entrees available at the various locations, why would we base a general analysis on the 1 and only item that is over $11? Out of the 100+ other entrees, the next most expensive is about $4 less expensive than the combo meal.
Using the combo meal as a general illustration, would be just as absurd as if I always used the cheapest possible QS breakfast for every QS credit. (About $7). You'll typically see in my illustrations, I use mid-priced items.
And based on your posts, I don't think you fundamentally disagree with me. I think you agree that the qsdp is only a legitimate savings mechanism for a small percentage of guests.