For me it's definitely more that I have a smartphone which facilitates easy access to a socially accepted addiction - sitting alone might make me passingly thin

For me it's definitely more that I have a smartphone which facilitates easy access to a socially accepted addiction - sitting alone might make me passingly think about some eventual demise but it certainly doesn't dominate my thinking. Wasn't this the basis of Terror Management theory ? I'm not sure that ever had much evidence for it, other than in some extremely general sense.