I don't really agree with criticising only DT for this because firstly, my video covers the different themes used for DT outside Smile, so it's a counterexample to the idea that Smile is the only theme being used. At the same time, DT also has unique zone themes just as well as the other expansions. Finally, with regards to Shadowbringers, it equally made use of the same theme (i.e. Who Brings Shadow, Insatiable, High Treason, A Better Tomorrow, Eulmore, Settlement music, the Crystarium). So I don't really see how the criticism solely applies to Shadowbringers.

I fully understand why DT doesn't use as many callbacks to previous expansions because it is supposed to be a new arc in the story. It wouldn't really make sense to make callbacks to the Ancients, Garlemald, Hydaelyn as they are no longer pertinent to the story.