Right but... there is a trend, which is that the longer the content has been out, the more people have cleared it.

(Longest) BA 19%
(Second Longest) DRS 9.9%
(Third Longest) Sil'dihn Subterrane Criterion 6.1%
(Shortest) Mount Rokkon Criterion 1.3%

So it could just simply be that people don't necessarily do content the moment it releases, but rather just do it casually over time and eventually find some time to give it a good lot of attempts and then clear it.