Disney has never had the "our customers will love anything we do because they love Disney" mentality. That is a comedic misunderstanding of how the company views its customers. They know that the market is always changing, and they try to change with it. Unfortunately, these changes don’t always favor the preferences of theme park aficionados, like us. As much as we may groan at the newest Spirit Jersey and color trend, there are still thousands of people who genuinely enjoy those things. While I may not always agree with the motivations for wanting those things, it is not my right nor place to judge them for such things.
The examples that you mentioned to prove your point were the result of a different flaw: the belief that all 2nd+ gates should intentionally play second fiddle to the castle parks. The only reason why we got TDS in that same time period was because OLC specifically requested and pushed past the half-day park proposals in favor of something on a similar scale to an MK.
The only example you have that lends a shred of credibility to your point is HKDL. However, it’s failure was mostly the result of budget cuts and misreading the Hong Kong Audience on a level greater than “they don’t just like it because it’s Disney.”
So, bringing it back to the B&tB Sing-Along: No, this was not the result of “they’ll like it because it’s Disney,” but instead the result of the directives and limits they were given. These were including, but not limited to, putting an Intellectual Property in the IdF Theater, no alterations to the theater other than new projectors, new projectors, limited budget, no actors, etc. This was the best that they thought they could do given the constraints.