Going with data for azeroth numbers (which poll directly from active accounts on the armory), only 16% of all players finished Sepulcher of the First ones on ANY mode, including LFR, and this includes both season 3 and 4. Compared to that, atleast 22% of all players got atleast Keystone Explorer in Season 3. So yes, M+ is more successfull than raids. And raids, M+ and pvp are the three pillars of the game, according to Blizzard (and with Dragonflight, their aim is to make crafting into another one).
Feel free to check achievement completion % on your own:
https://www.dataforazeroth.com/chara...ostwolf/khatia
- - - Updated - - -
Maybe he wants every cosmetic item available through a lootbox he can get once a day via some world quest or something.
*shrugs*