I feel like this is intellectualizing something that isn't that deep. It's a word you say, not think about. Why do English speakers say "excuse me" after a sneeze? The answer is apocryphal and uninteresting.
The closest analogue I can think of is diamond engagement rings. Doubtless they were given out prior, but they became formally 'normal' for a while. Of course, one was orchestrated and the other was perhaps just the effect of picking some formal culture to teach and so on. But it is similar in recency of popularity.
Conversely, the way things become deep is because we intellectualize them.
I just take issue with this type of analysis for trying to generate that depth - as an etymological lesson, it's minimally interesting, but as far as it tries to "say something" about Japanese culture, it can't.