You'll hit ransack really fast that way. Every chest in a quest gives bones, not just the end chest. Plus the saga gives you 25 bones of your choice.
That's only half right.
Even if you clear quests with Elite or Reaper, you'll only get 4-7 Bones from one chest, but in the wilderness, you can get two types of Bones from one chest, each yielding 2-5 pieces.
That's more than when you open boxes with Reaper!
With luck, you can open a box outside in 20 seconds.
Ransack? There are 9 types of Named enemies in the wilderness that drop Bones.
By the time you open 71 chests (8x9), you'll have enough materials.
You don't need to threaten to do 3 rounds in Elite, even a newbie can easily gather materials in the wilderness.
The characteristic of Wildness is that even in solo play, you can easily achieve results surpassing those of Elite or Reaper in your spare time.
Unless you specifically want certain items or desire the Bone Picker, of course.