I have a wireless audio configuration which introduces 200ms latency. This is usually unnoticeable because I watch almost all my video through mpv, which lets me set a 200ms delay on the video to compensate. I can't play Netflix titles through mpv, and as far as I've been able to tell, the Netflix player doesn't have an AV sync setting.

My setup is idiosyncratic, and I wouldn't expect Netflix to build in every feature of power-user video players like mpv and vlc. As long as Netflix uses DRM, their service will be inadequate for some small segment of the population, and that segment will pirate their content, because their DRM has done nothing to stop their content appearing on torrent sites within hours of its release.