...but making everything gritty and dire...
That's exactly my thinking. I don't mind there being "gritty dramas", even I might watch one once in a while. What I hate is that everything seemingly has to be made that way.
Also, a proper story doesn't have to be either or. The best adventure stories and mysteries have moments of gritty, without being overwhelmed by it. That doesn't make them Pollyannish kids stories, as some people seem to think.
It's a shortcut for the intellectually lazy; like what everyone else hates, hate what they like, and people will mistake your contrariness for intelligence.
You might be right there. That would certainly explain it. I was just putting it down to a very irritating fashion.