What does an individual's productivity have to do with this?

And also, the individual productivity has stagnated over the last decade.

There's a limit to how many divs a front end dev can insert per hour and how many toilets a plumber can install per hour and this hasn't gone up lately.

Also, wages have not kept up with an individual's increase in productivity as all the gains have been skimmed by the top shareholders, not the workers.

So, please don't confuse the rise in stock prices of the bull run in US in the last decade with the rise in wages as a lot of workers haven't felt it.