Brooker was apparently planning a spinoff or something called Red Mirror for which the Demon 79 and Mazey Day were written for. He talks about it in some interviews and there’s plenty about in on the Wikipedia page for the new season/episodes. He goes into further detail, but honestly it just sounds like they couldn’t make their mind up or ran out of ideas and came up with a bunch of backpedaling and excuses about how the people act and react the way they do because of technology or lack of it. In Mazey Day the technological/sociological aspect is supposed to be how society has changed since the hey-days of paparazzos and how everyone is a paparazzo now or some such. He just wants to explore different things now I guess.

I agree they work as stand alone things, but neither you or me are clearly not alone feeling that it’s not quite Black Mirror - even though I could live the rest of my days without a single goddamn werewolf story, especially one as generic and plain as this even if it was a decent production.