And that is where magical bags, which are rather easy to obtain, are useful. Also, a lot of items can be crafted which reduces the actual weight of the equipment you wear. If you are member of a faction you might also have access to some storing cabinets allowing you to store the more heavy equipment you're not likely to use while you gather ressources. It makes senses to me as well that ghouls would be as heavy as any living humanoid, so at 5.5 pounds per skin it does not seem that problematic to me. All in all, the solutions are around to help you manage equipment weight and I am highly doubtful ghoul skin's weight will change anytime soon.