Out of the FAANG companies I can’t speak for Facebook and Netflix, but I can assure you that the engineers at Apple, Amazon, and Google have a broad preference for macOS and Apple laptops. Since the pandemic even the engineers using desktop Linux have mostly transitioned to Apple laptop + remote Linux server.
Applied scientist is not and has never been the definition of an engineer. Dating back to the term’s earliest usage, predating both modern English and the scientific method, it has meant someone who designs and maintains complex machines.