“Shadowlands” is essentially the first true new expansion since “Mists of Pandaria”. It’s a completely new world/dimension and the Shadowlands do not have any large previously established lore only short and small notes here and there. It’s the first expansion without any old burden attached to it. Sure, we have Sylvanas but she has no longer any connection to the Alliance, the Horde or the players and has become (more or less) just another bad guy similar to Kil’jaeden, who was also important in the lore but in the end he was just another bad guy.