Critique: Why not have SC raise across all Shells?

You can only ever inhabit one shell at a time so there's no reason to spread SC across shells. I end up transferring SC between shells every time I switch, which is silly.

SC should just raise equally across all Shells. That way I don't need to think about my point allotment every time I switch. It's starting to get cumbersome now that I've got multiple shells with specific abilities I like.