That really makes it seem like Facebooks stance is: "As long as we have a few really huge projects that infiltrate most companies' codebases, our 'smaller' projects can drop the patent clause".
Hmmm.. in that case the people who actually need this advice even more would be the maintainers of ZSTD who seem to have hastily changed the license after seeing the backlash from the Apache policy change. Care to stand by this opinion and leave your comment on the thread which discusses the license change over on GitHub?