World of Warcraft has ALWAYS been primarily a single player game with optional multiplayer content. From the original box art -
https://gamefiles.alphacoders.com/bo...back/149-1.jpg
"Play Solo, or enlist fellow heroes to join forces with you as you negotiate the vast, battle-scarred landscape of a world at war".
This is beat to death, but MMORPG just means there are other players running around in the game world with you, not that grouping is required to do everything. The original EQ, FFXI, DAOC etc are games that embraced that mantra and certainly something World of Warcraft didn't. So telling someone who enjoys a largely solo experience that "WoW isn't the game for you" is pretty much false, and always has been.