It wouldnt be hard to make something for the people that missed out on any WoW Classic content to go back and complete things at their own leisure by themselves. Create a Raid group that is filled with bots… Have them in basic gear… Example all in green lvl 60 gear and then players can be the raid leader and have a team of bots allocated to them that earns gear the way they do… They progress through Strat, LBRS/UBRS/ZG/MC and onwards earning the gear the same way that a raid would and you as the player are the Raid leader giving out the dropped loots… These are stored on your raid team and you come back and play the same way you would with normal players and earn gear to beat bossess and also the NPC characters “Skill” level increases as they play fights over and over to they can farm raids for better gear… This would close the disconnect between those that dont have the time/cant find groups to do anything anymore…
Just an idea