You can get 1080p streams from Netflix on Linux (for 99% of their collection) by switching your user agent to ChromeOS. Their check is just:
a = /CrOS/.test(a.userAgent);
this.Fma = this.Aw = q.Gu.PV;
this.Qm = [x.$l.nV];
this.oo = [x.V.vA, x.V.wA];
a && this.oo.push(x.V.TH);
It very much is _not_ "DRM not yet implemented".
Both Prime and Netflix are fully capable of streaming their highest quality under Linux - if you have the driver support.
Unfortunately they have a bunch of hacky stuff trying to prevent it, rather than allowing the user's browser is to make the decision.