corporate profits decrease very slightly
This is the thing that people will reflexively point to, but this:
quality of life increases
This is the real issue. If quality of life increases, workers are less desperate, and are less willing to put up with their employers BS. Moreover, if other jobs are also paying a living wage, it's much easier to quit.
We have seen, over and over, that businesses are willing to spend money to exert control over workers. They'll do it even if it means a decline in profits, or even in revenue. Because at the end of the day, if you have your needs met, any money left over is just power, and power is meant to be used to control others.
And won't somebody think of the private sector! It just doesn't have enough control over the public good!