The average worker today produces far more in an hour than the average worker from the '70s did in the same time. And while I get that the increase is not unifo

The average worker today produces far more in an hour than the average worker from the '70s did in the same time. And while I get that the increase is not uniform across all workers I am sure it is an increase. What is the reason for keeping wage tied to time rather than productivity or work, other than a quest for ever increasing profits? And if the wage can't be increased why not decrease the time? This way the worker gets a reduction in time for the same wage and the employer still gets a hefty productivity increase over a few decades ago for the same wage. I see some countries have actually kept wage and productivity tied to each other and it doesn't look like it was detrimental to the economy. I'd appreciate dissenting opinions in a more productive format like counterarguments rather than a wave of downvotes.