It's funny how expectations being set differently can lead to such massively different reactions. Chrome OS or Android devices require Google accounts? No problem. Windows requires a Microsoft account? So angry! I think there's also something to be said for the ubiquity and usefulness of these accounts outside of the OS setup. I don't really feel that I need a Microsoft account in my life and I can't say for certain…
Never had a Chromebook, however at least in Android I know that you can skip the Google login on setup and it does not use any dark pattern (just click Skip when asked).