#1: True that Senior workers make more money as they are higher on the payscale. Thus, you have someone that has more experience and knowledge, and often learning government bureaucratic (and sometimes idiotic) systems takes time.
#2: My agency (which was once considered government “essential”) has merged with a contract agency. The pay was SO LOW for the contractors, that somehow the pay was raised so they could hire in some qualified people. Contract workers salary is NOW equal to that of a government worker coming in at Step 1. (Albeit, benes are not as good for the contractors)
#3: The newly hired contractors DO NOT want to do the government “essential” work. So, they are forced to do it, have no interest and are basically making a huge mess of things. The contractors also have a high rate of turnover. Who would you rather have handling your case–the government worker or the contractor?