tropes are non-medium specific outside of mechanics (example: no visual tropes in literature) and explanations of origins/popularity
is what I consider to be accurate. I would note, however, that just because a trope originates somewhere and is known to us, doesn't mean it's migrated yet. It's also possible that examples will bias themselves depending on current trends.
Essentially, I don't view the majority of the problem as the inherently malignant "this trope belongs to this
medium, everyone else can fuck off" as "hm, I mostly see this trope in this medium I consume a lot, I should lead the description with that" fluff in the description. It's just that B looks like A if you're not familiar with it.