I’m sorry, I not sure I’m understanding the question, so if my answer is bizarre, it’s probably because I misunderstood you, and I apologize. I’m also only an occasional watcher of the show; while I quite like it and generally agree with Jo, I can’t begin to answer *for *her. But for my part, I’d be quite shocked and disapproving if a normal healthy 2.5 year old was still exclusively eating baby food. An old favorite or two (hey, the Pear/Applesauce seriously does rock!), I wouldn’t fret, but it sounds more like it was their whole diet. I don’t think that’s good for a couple of reasons: one, they just need more texture than that to develop good oral musculature. They need to chew and swallow in order to develop muscles needed for talking well. Too much pureed food for too long doesn’t give them opportunities for that.
Secondly, because by 2.5, you’ve missed literally thousands of easy opportunities to widen a child’s palate by exposing them to different tastes, textures and temperatures. While there are more varieties of jarred food available than there used to be, the very nature of the canning process ensures overcooked mushy food.
Thirdly, I feel that kids need to learn early on how to work as a family unit at mealtimes, eat what’s provided with a minimum of fuss and really be a part of the group. Special meals inherintly make them “other” and should, IMHO, be minimized as much as possible. My own daughter’s gluten intolerant, and while she can’t eat everything we do, I try my best to make gluten free approximations of what we’re having, instead of entirely different meals just for her. Sure, if we have barbeque, she can’t have a kaiser roll, but she can have pulled pork on millet bread or a potato roll instead. I consider it sort of akin to the “least restrictive environment” goal of integrative education - the smaller and more subtle the adaptations, the more inclusive the experience. Sure, you might hate Mom’s Tuna Surprise, but we’re all going to hate it as a family, darn it! 
Fourthly, it’s just so darn expensive! If the kid is 2.5, she’s probably eating two or three of those little jars for one meal, and that’s just…crazy talk! Why not just make it at home? (Of course, I kind of feel that way about baby food in general, but I can see how some people find the jars convenient for wee ones.) Since their diets don’t have to be restricted any longer, why do it?
Finally - and this is just me being a lazy, lazy mom - I am not a short order cook. I don’t want to be preparing two entirely separate meals every night, even if one of them comes out of a jar.