This is not the problem. The problem involves Dual Builds: If build 1 is a Crab, then build 2 will have the backpack even if build 2 has no Crab powers.
Respeccing build 1 out of Crab would remove the backpack, yes, but what if people want to have one build as a Crab and another as a Bane or Huntsman without an unusable backpack? That's what people are upset about
Some say that the crab backpack is permenant. This isnt the case. If you completely respec any crab powers you have, when you come out of the respec, your character will stop any actions theyre doing, and they will appear without a backpack. That means you can now add capes or any other things you may need. Hope this helped.