All this debate about “casuals” “solo players” etc is just semantics.
It doesn’t change the central point that players who DON’T participate in organized game play with constant groups to do raids, or M+, or rated PvP … are left behind in 9.2 just as they have been for most of SL … and that’s partly why we have had such a major exodus of players - most WoW players don’t mostly play for organized group content … which isnt; to say group content isn’t important or participated in … but that a good chunk of those players are doing group content through pugging (and to pug you have to get into groups, and to get into groups you have to have a way to progress your character outside of group content … otherwise if you fall behind at all you get locked out of pug groups).