What if they moved towards a more incentive based system. Workers who do 60% efficiency targets get minimum wage. 70% gets minimum wage + $X.YY and hour. 100% gets typical wage rate.
Adjust hourly wages up and down for the next day, based on the previous days productivity. Then nobody has to get fired for only being at 96% productivity that day.
Perhaps the increased job security would offset the somewhat dystopian productivity tracking this would result in. Workers might prefer to work a day at 85% wages to get back up to 100%, than to be fired?
Though, I suspect treating their workers better and giving them more benefits, security, and humanity would be about cost neutral compared to their intense current system of treating workers like cogs. You can only squeeze someone for so long.