Nobody is arguing that technology won’t progress. Even Marx defends that as a precondition for socialism/communism.

The question is the following. Tomorrow a ground breaking technology is developed that makes literally everyone twice as productive. (Please let’s ignore the technical aspect of this. I’m simplifying for the sake of the argument, but this is happening at some paces everywhere).

Now you have 3 options:

1. Everyone can just work half the time for the same productivity. I.e. the economy can sustain itself with people just working less (which is a MAJOR quality of life increase).
2. Everyone works the same amount of time but their salaries double.
3. Everyone works the same amount of time. Their salaries increase a small %, perhaps keeping up with inflation, perhaps a tiny bit more than that, sometimes even not keeping up with inflation. The added productivity results in increased wealth aggregation at the top.

Number 1 is what people are talking about in this thread.

Number 2 won’t happen because salaries aren’t actually tied to productivity. Productivity just sets a higher limit on salary that in any case is never reached. The salaries are actually determined by competition between workers.

Number 3. Has been happening since the seventies and will continue to happen.