Except the 8 hour work-day and weekends, I guess? https://www.politifact.com/truth-o-meter/statements/2015/sep...
I think that's one of the most relevant needs that would drive tech workers to form a union.
It still applies, and the status quo can get worse as soon as worker's power wanes.
As a society, employers were trending towards 40-hr workweeks and weekends. That was already where society was going voluntarily, so the fact that unions got legislation near the end of the trend (when voting it through would've been so much easier) isn't that much of a victory. It was unnecessary and just a play to take credit.
You write as if this happened on its own, 'voluntarily', by 'society' as a whole, when in fact it was driven mainly by one part of society - workers:
> "Demands for the five-day week began to proliferate in 1919, a year in which 4 million American workers went out on strike," said Priscilla Murolo, a professor of history at Sarah Lawrence College. "That was about 20 percent of the industrial labor force."