Sometimes, a trope isn't the tree. It's the whole forest.
That is, when you see something used in fiction, it can seem to not mean anything. It's an artistic choice on the part of the creator, but it has no actual meaning beyond that and you might be tempted to label it "not a trope
Until you look at a whole genre, or even all of fiction, and notice that this particular artistic choice happens a lot. A lot more than it ever happens in Real Life
, in fact. It's nearly universal
to a genre.
What you have here is an Aggregate Trope. It's a storytelling pattern, but that pattern only becomes apparent when you take all the examples as a whole rather than look at individual examples. The key word here, is "tendency".
Compare Garnishing the Story
(in that the pattern is completed by the notion that the elements improve a story by their inclusion).
Tropes that are only a trope in aggregate: