Maybe smart phones are bad for our mental health, but I think reducing our entire experience with the world into mental health is the worst thing for our mental health.
In much the same way as individual people are blamed for CO2 emissions and make you worry about your carbon footprint as a cynical ploy, it’s a type of shifting the blame from where it belongs.
The thought process behind this is: “your personal mental health being bad must be a personal failing rather than external factors, or else the system would need to be changed. And that simply would hurt profits.”
My biggest worry on this would be where you’d get them re-threaded.