[amatic]

That is all true. Still, try pointing that out to truck drivers (for example) when they start getting laid off because the company can't handle the automated competition. Economy-wide, there will always be jobs for people to do, it is the large number of individual workers who will be scared for their particular jobs.

[InclinedPlane]

This is true, and very important. Volatility in jobs can potentially put those at the bottom at an increased disadvantage, while consolidating the advantages of those who are already well off. Partly this is because people are "falling down" the experience ladder when starting a new career and their lack of economic buffer means they also can't negotiate decent wages. And too, new industries means that the hard won organizations (like labor unions) and established norms in pay and working conditions are no longer present, putting folks at another disadvantage.

Which has almost certainly been a factor in what's been happening to labor since the 1980s, who have seen their wages remain stagnant and job security fall through the floor (especially for those under 30) while the economy and productivity continues to grow and grow. This is, I would say, fairly obviously a bad thing, and requires a lot of rethink in order to makeup for the extreme power imbalances and iniquities at play, but very little of substance has been done about it so far.