What if they brought back unique Followers(WoD Garrison style), but turned them into Dungeon/Raid companions for Follower

Edit: Sorry for bad wording in the Title.

I’ve been thinking about the old Follower systems from WoD/Legion, where you recruited unique characters in the world and sent them off on little missions.

What if Blizzard brought unique Followers back, but instead of sending them on passive missions, you’d build your own roster of NPCs and actually take them into 'Follower Dungeons and Follower Raids'

You could recruit Tanks, Healers, and DPS from different races/classes, level them up, gear them, unlock traits/talents, and eventually build your own dungeon or raid team.

This would be a dream for solo players and it could breathe life into old zones too... imagine going back to Shadowlands to recruit Bwonsamdi to raid with you.

Edit: I love the Warband idea as well!