The preach one, ya, the raider io info used from Blizzard’s api that can be accessed had some interesting tidbits. I think the rate at which people got loot made it feel rewarding and enticed people in Legion to really go ham.
BFA came along and had some iffy dungeons people genuinely disliked but still some interest with the drop off being a disinterest in the expansion.
Now Shadowlands has had a big shift to another extreme and for the time invested, more and more people are seeing that it’s just inefficient and unrewarding hence more ‘qq posts’ or less participation/bigger drop off.
BUT THEY GAVE A BIT MORE ANIMA SO THAT’LL HELP PEOPLE! 
lol