I watch allot of movies and TV shows off of Netflix per month. With mobile device access I'm able to download content and watch it on the go. The OP simply, as he said, has not watched the Black Mirror TV show or given it a chance, or is familiar with some of the great content that is on Netflix.
I do not know what the split tongue thing is referring to. I've looked at most of Black Mirror which is a TV show that introduces us to actors such as Daniel Kaluuya, Donald Gleason, and others like starting their acting careers off this British channel 4 TV series. This is like a modern tech slant to Twilight Zone and some of the episodes rival some movies that have been released in the past 8 or so years. Their episodes are weird that you have to sit through the first 20 minutes or so before it really picks up, but once it picks up, really picks up. I credit, a youtube vlogger, "Beyond the Trailer"/Grace Randolf for her videos which encouraged me to watch this TV-show. If it weren't for her, I probably would not have given this TV series a chance.
There is another website I look at called "What's Leaving Netflix Canada". I normally scroll through content that's due to leave Netflix and then look at both the IMDB and Rotten Tomatoes ratings to evaluate if a gem or movie that I might like is leaving. In this function, I've some across films that have played in international film festivals which have won awards. This has put my attention to some high-quality and experimental art-house films that weren't wide-released, but have merits in and of itself that might make it worth a shot to watch. Some lesser known movies that are good may have been referred to me by watchmojo missed movie releases for a given year, or other youtube video reviewers. In a modern digital age, it's easier to get referral of lesser known but high quality movies (i.e. due to the fact it was not advertised well enough, wasn't wide-released, or was overshadowed by other major releases) from youtube videos without actually knowing people who are into this. Again, if it wasn't for these supporting websites, video reviewers, then I might not be using Netflix much at all.
Another credit for this consumption is that I also have a home theater system which consists of a decent sized 58 inch HD TV and a projector. Prior to this set-up I may only have watched movies I was super excited about but not be too crazy about art-house films (i.e such as Leave No Trace) or some children's movies (i.e. but are crafted in such a way that adults can watch as well -- such as Incredibles, Christopher Robin,). However with the new set-up I'm more apt to watch this type of content because it's more palatable blown up in size.
Lastly is the documentaries, nature based movies, watching animals in the wild, watching cooking videos, which are also all on Netflix. Not something minor at all but there is lots of general interest based stuff. I'm guessing you might be able to see most of this stuff for free on youtube anyway. However, with websites such as "What's Leaving Netflix", if any good docs are leaving, I may be more inclined to watch them, then if I'm not aware that it's leaving where I would not otherwise watch it since that incentive is not there on youtube.