Your argument is heavily skewed towards viral song with viral moment like TT key point choreography etc, but viral doesnt equal to national hit.
If u take viral hit = national hit, i bet half of the songs with biggest digital points wont be up there. Songs like Spring day, some OSTs have pretty good chart run (peak wise and longevity wise), but going by your logic, they arent just because they never went viral.
WTF are you even talking
i never talked about viral moment or viral choregraphy
impact on the population can be measure different ways and not you mentionning Spring day -_-
when i literally explain why Spring day song was a national hit because it got the cultural impact to be call a national hit and not just a well charting hit
Viral moment help but it's not the only thing, and as much you can say AIIYL did well in the chart etc... i never saw any Knetz talking about AIIYL, being consider by any koreans like a national hit