Mythic Keystones need 3 things
- Scaling anima rewards
- Higher ilvl loot for 10-15 keys (10 ilvl 203, 11-12 ilvl 207, 13-14 ilvl 213, 15 ilvl 216)
- Valor point system
You don’t need more loot to drop in M+ to make it better (since it’s spammable content) You just need it to be worth doing when compared to something like pvp gearing.