Know nothing about this. But say they couldn't be transferred. Then you could have moribund companies holding a patent and doing nothing with it thus stopping o

Know nothing about this. But say they couldn't be transferred. Then you could have moribund companies holding a patent and doing nothing with it thus stopping other people from doing something that would benefit the world. But given that they can be transferred, there is a market, so a moribund company has an incentive to pass the patent on, and the patented thing gets realized, by someone.