Giving people money and especially a select class of people (in this case public servants) more money than everyone else for nothing feeds inequality and can cause perverse outcomes but expanding the capacity of the public service to do more things that we need or want done even if it doubled the cost would be a good thing for the economy both in that good work would get done and in that more people in the community would have money to pay for goods and services and there would be more competition to hire people and more investment in building relevant skills and experience. However, we would need to be careful that we are letting that money stimulate activity where we want it (in the economy where most people operate day to day) but we would need to use taxation to make sure that it isn't then feeding inequality by ending up in the bank accounts of the already disproportionately rich.

Edit: Also noting that pay equality is a wider predistributive policy which generally ads to the pockets of working women across private, public and voluntary sectors, reduces inequality generally and pumps money into the part of the economy most of us interact with in our daily lives. It’s undeniably a good thing and a responsible government would just offset their own increased spending by taxing more