This seems to be a pretty niche use case brought about by changes in the available hardware for servers. Likely they are having situations where their servers have copious amounts of RAM, and CPU cores that the task it is handling don't need all of, or perhaps isn't even able to make use of due to software constraints. So this is a way for them to run different tasks on the same hardware without having to worry about virtualization. Effectively turning a bare metal server into 2 bare metal servers. They mention in their statement that, "The primary use case in mind for parker is on the machines with high core counts, where scalability concerns may arise."