This seems counter intuitive.
All nflix da should require is the interfaces outer needs.
Network stack CODECS CRYPTO stack (DRM)
The OS seems irrelevant.
I mean sure you worked be limited to whatever interface a browser could provide.
It's not as if certification of a certain operating system means anything other than the certificate.
Netflix used play4sure beck in my days at Apple, and literally t out was a tick box for them to assure the content owners they had DRM.
Nobody certified apple's netflix app for ATV back then, I know, Ben Lee and I wrote it...
We desperately need OS research, exokernels should be a thing by now, at least then the question becomes moot.
Windows, (alphabet)OS, Linux and BSD all provide operating systems that enable productive work but there's a lot of cruft