I’m not understanding the logic. Just because they’ve had chances before and after it doesn’t mean there’s not an inflation in the after.
There clearly is inflation longevity wise post the chart change. So calculating average impact based on weeks at number one uniformly before and after has limitations as it penalises groups who had their hits before the chart change and elevates those for the after as songs last longer on top. 6 weeks at number one now is not the same as 6 weeks before the change. So having an equivalence of “true peaks” across the two eras is odd lol
Even if songs stay longer at the top now, it becomes a lot harder to get to the top. It balances out that way. The inflation you speak of positively and negatively affects all groups equally. The inflation you speak of also mainly pertains to the top 10 mores o than number one.
But, just due to the slow fade out of the 3rd gen, few 3rd gen songs have hit #1 on melon since the change.
If we redid it to only include before the change in the middle of 2020, the list really wouldn't look that much different. Every group would have the same average except one. BTS would just change drastically as Butter and Dynamite would be out.
2014-mid 2020
1. Blackpink - 63 Days / 3 Songs - 3 Weeks per #1 Song
2. Ikon - 47 Days / 3 Songs - 2 Weeks and 1.67 Days per #1 Song
3. Twice - 99 Days / 9 Songs - 1 Week and 4 Days per #1 Song
4. BTS - 14 Days / 2 Songs - 1 week per #1 Song (would be out of this list for only having 2 songs)
5. Mamamoo - 14 Days / 3 Songs - 4.67 Days per #1 Song
6. Red Velvet 8 Days / 3 Songs - 2.67 Days per #1 Song
7. Winner 10 Days / 4 Songs - 2.5 Days per #1 Song.
So really you complained for almost nothing. Or you were only complaining about BTS. Twice's 2 hits dragged down by their many faux hits, Mamamoo, Red Velvet, and Winner still lacking much lasting impact etc.