I think most people agree you should be able to "sell the rights" in the sense of licensing them to someone, and to allow others to sublicense, and to enter contracts that grant exclusivity for sublicensing.
What's somewhat bizarre is that you can permanently transfer ownership of the work, making it legally as if the other person was the original creator.
I don't think it's bizarre. If I'm a tailor and create a new suit, I can transfer ownership to someone else. If I create music then I should have a similar right to permanently transfer copyright ownership. To me that seems 'natural', and moreover it makes the copyright more valuable, providing a greater incentive to produce the music.
It's useless to try to compare physical goods to creative works. A tailor can't retain a suit while allowing me to have it. A musician can give you a song, but still have that song. These concepts of ownership just aren't compatible.
What's somewhat bizarre is that you can permanently transfer ownership of the work, making it legally as if the other person was the original creator.