Yes but where has this happened. I suspect it's happened through automation. Meaning that the productivity gains might not be per employee and might not easily translate into the pockets of workers.
Or, perhaps, David Graeber wrote in his book «Bullshit Jobs» that at least a part of the gains inflates the bullshit part of businesses, i. e. more bullshit managers are employed. Of course this means that the hourly pay would rise. I don't know.