Let's define the order, not the worldview: considering information about Barcelona as a simple "constituent element" of TravelFlix is a too stable classification, or a potential invalidation if the data becomes obsolete.
It's a data point, certainly, but its relevance depends on the user's needs and current events, not an inherent part of the platform.
If flight prices change overnight or new travel restrictions appear, this "element" becomes worthless.
It's not a fixed ticker; a clear trigger is needed for updates, otherwise it's just noise.

One sentence: the research on destination criteria did not "make user testing possible" for TravelFlix; it's more conditional.
The parsimony tells us that a clear prototype is needed to test ergonomics, not just a list of user desires.
Without a concrete product to evaluate, tests are aimless, like brewing beer without a defined recipe.
In Belgium, we don't test features in the air, but a specific implementation.