The length of time it takes to get just above a bare minimum ending is still longer than most other 3D Mario games . BTW, the entire concept of the bare minimum ending is to prevent novice/casual players from feeling frustrated because they cannot or do not have the time to find all the collectibles (this was a criticism for some of the earlier collect-a-thon style platformers). While some of the Moons are hidden in somewhat meaningless ways (like the feathers in Assassins Creed or Korok Seeds), there is a great number of them that are unlocked after completing meaningful quests and platforming challenges. Case and point, I watched the play through you posted as well as 2 other playthroughs, all three of them collected just a bit more than what was required for the ending. However, aside from the more linear quests that often end in boss fights that reward you moons (these overlapped for all players), each player found different moons. Not to mention that like other 3D Mario games, a great portion of the game (including several other kingdoms and more missions) are unlocked after you beat the game (again most likely not to frustrate more novice/casual players with that task of having to finish everything before getting the main ending).