I'm sure some cases of it happened somewhere, there are some papers, and some appeal to authority is a given, but do we really know if WFH equals mental health issues en masse?
For example, I wonder if: long commute, all the preparation before/after a work day, and resulting overall diminished free time causes more mental issues or not.
What about constant interruptions, loud neighbours and that white light above you, even though you'd rather have it yellow? All the inconveniences of sharing a place with other people, wouldn't any of this take a toll?
Seems to me when "office" is heard everyone thinks of that one nice summer evening after work and had a few beers yada yada, nobody seems to remember that cold-ass winter day where you would rather stay in 5 levels of blankets yet had to go to office, then slipped on ice and landed on your ass.
Maybe it's true and WFH will turn most people to madness. I'm just saying it's not an established fact of life, and opposite is also very much possible.