I am not thoroughly convinced that non-physical labor jobs are zero sum, necessarily shrinking and/or reduce other employment. Why should I believe that? Can yo

I am not thoroughly convinced that non-physical labor jobs are zero sum, necessarily shrinking and/or reduce other employment. Why should I believe that? Can you cite any evidence to this effect? Furthermore, if white collar jobs are "shrinking" means they should be irrelevant, manufacturing jobs are shrinking means they should be lamented? Lastly, what if increasing automation means that manufacturing jobs will inevitably go away regardless of how anyone feels about it or complains about it? What do you propose to stop that? Manufacturing output of the US has consistently increased despite any variance in the amount of people it employs or the state of the rest of the economy.