Yeah, exactly, what does this actually accomplish besides putting the user in a worse situation where they are no longer given any sort of patent grant?
At least it might give the louder parts of the community that have been consistently complaining about this issue a good reason to stop shouting quite as much
Because an unspecified parent grant is most likely an implied patent grant, and especially for FOSS there is a very strong case since your are explicitly permitted to study, modify, and use any part of the code.