The main thrust of my argument is simply, and throughout, has been this:

In the last 50 years, "worker productivity" has increased dramatically. compensation has not. The increased wealth that we are all generating is not making our lives better - it's going into the pockets of billionaires.

As you put it "the real median wage has not changed since 1980". As you showed with the graph you posted, the increased wealth that is being generated is increasingly going to the wealthiest people. This is all the data we need to support my argument, and they're both claims you have made.

The "improved living conditions" from better technology and industrial processes do not REQUIRE us to be giving all the extra wealth we're generating to the wealthiest people. These would still exist if we were taxing billionaires and large companies more, enforcing better wages for regular people, and investing that wealth into social programs.