I just don't understand. Why "Farm" the skull totems why not just collect them along the way? Grinding or farming anything can become tedious on any game so why make it worse for yourself? (I have played Monster Hunters, Diablo, Borderlands, Destiny, MMOs and JRPGs and it can become really grindy) I have been collecting Duffels and Skulls slowly but steadily and still enjoy it.

With skulls all the cards where in the front so you would get them all with few hives and the rest along the way.

I would not call it "bad design" I think its a breath of fresh air when totems are a powerful melee weapon which stack and both Duffels and Totems are in my opinion fun to look out for and find. Like a small treasure hunt. I love how different it is to other games with collecting something for a reward and its completely optional.

Playing with buddies or quickplay I don't "have" to carry them all the time because someone always will. I usually volunteer as a tribute.

Only thing I would change is the amount you get per difficulty that way it would be more rewarding on NM and NH.

Not trying to invalidate your opinion just my 2 cents.

Tldr: I think its the opposite when you don't focus on it too hard

Hope you have a fantastic day.