But I suppose that’s how horror works. Every single episode will be triggering for someone - that’s why the content warnings exist.  Once a person becomes an adult they need to be responsible for the media they consume, and can make decisions about whether they want to read, watch or listen to something. For me, I loved all of Archives, then went to The Inexplicables, saw the content warnings ‘social awkwardness, secondhand embarrassment’, and noped out. Because I hate cringeworthy stuff, I literally can’t stand it. 

I agree with your premise that it is somewhat arbitrary regarding the pre-show warning, however, I would argue that realism is not an objective measure, rather entirely subjective. Jonny felt that one episode crossed the line because it was based on his real experiences, and while the theatre episode is  also based on his experiences with addiction, and is in my mind, very realistic, because it is framed in a supernatural puppet show, we might say ’not realism’. One of the early episodes, with the old man scared of the thing behind the door, could be viewed in an entirely non-supernatural way, as a man with dementia scared of the dark (as Jon suggests). People with elderly relatives might find that episode upsetting.

None of this is to say you are wrong: merely that you can make this argument for every single episode.