Originally Posted by
Marxman
Which can easily be contributed to several factors, none of which are "raiding is less popular".
A) BfA has lost a metric fuckload of players. I'd be shocked if the playerbase is at 50% of what it was in Legion.
B) Raids are harder, leading to lower overall clear percentages. Too hard, I would argue (particularly with end bosses like Jaina and Azshara).
C) The amount of busywork nonsense you need to complete to be a competitive raider has never been higher, not even in Vanilla with world buffs and stacking consumables.
D) Mythic+ has eaten into the raiding community significantly because it's faster, easier, more rewarding, and requires less effort overall. Without tier sets, there is not really any specific incentive to raid, considering how grueling progression raiding can be now.
I personally think (C) is the largest contributor, followed by (A) and (D).