This is the first phase in the push for that old chestnut: equal pay for 'equal value' work.
Which nobody has a problem with, assuming that it means that two people employed in the same job with equivalent training, experience, productivity etc get paid the same hourly rate regardless of sex, colour, religion, politics etc. Pretty much everybody is perfectly happy to back this.
However, equally most people would consider it fair when person A who works 60 hours a week gets paid 50% more than person B working 40 hours a week because most people would consider it to be taking the piss for person B to demand equal pay to person A if they are only doing half the hours.
Biting the hand that feeds IT
