When thinking of that as the default, within the culture, “we know what it actually means” is the most salient.

When thinking of that as not the default, in a cultural comparison, “how are analogous-role conversational elements expressed differently” is the most salient. So compared to a culture in which you don't ask that so cheerily, obligatorily, without-‘really’-meaning, yes, it totally is fluffy.

(Speaking as someone who's theoretically American but culturally ambiguous, who's recently been suggested by someone reviewing my social skills in a professional capacity to inject more low-content happy-mood pleasantries into my conversation—they may have actually used the word “American” in the process, and I hardly disagree with the connection. Of course, that's papering over a lot of intra-American variation too.)