I think this is a very useful episode and I think the team covered what can be a complicated topic pretty well
The only thing I would add is, as with any of the dining plans, it matters as much "how" you eat as it does "where" or "what" you eat. As Tracey said "for most people that plan to eat a sit down meal every day it usually makes sense to get the dining plan" - I would at that it does IF you plan to eat as it is laid out as what comes with your meal. So for the deluxe, is everyone in your party going to want an appetizer, and an entree, and a dessert, and a drink? For every meal? If so, then it definitely can work - but we often will just get appetizers, or split an entree, etc. So we have found the dining plan is too restrictive for us - but I know a TON of families for who the plan makes a ton of sense
So the question of "should I get the dining plan" is definitely not a simple "Yes" or "No" for every family - think about how YOUR family wants to eat while at WDW and then see if it makes sense for you to get it