Account-wide progress will let alts continue the story instead of starting over Playing World of Warcraft gives a player lots of choices and quests, which in theory is fantastic.
Those players will likely be happy with the approach Blizzard is taking in the next expansion, Dragonflight.
Players complained about having to grind their Renown, Conduits, and Covenant campaigns in order to get all of the new goodies.
Some people like to focus entirely on developing their main, keeping one character of choice up to date with all the current content.