See, even if you end on your own terms your show is technically cancelled. So Netflix doesnt want to look like the bad guy by cancelling their shows. They have done it but not for something as high profile as HOC.Netflix is just as bad as the rest of tv (and movie series. and comics) about this.
Just keep the damn things running until they fail in rating.
It's a shame the lack of interest on telling an actual story as opposed to a never ending set of anecdotes.