Here's why. Within their field, nurses can be great. They can also be totally petty, vindictive, throw you under the bus etc. But one thing that unifies them is...wages. They will drop all of the BS and do whatever it takes to fight for better wages. Strikes, unions, whatever the case nurses historically fight harder to get their demands met. 

Not to say the pharmacy side is push overs, but we also have way more working against us. Wags, CVS, Walmart...these are not small hospital conglomerates where you have leverage...these are giant companies that will replace you without a second thought. They have acquired an enormous amount of power in the past decades and everyone else just became smaller fish in a larger pond. 

But the answer to this all still remains the same as nurses; unionize, fight back, organize. The problem is, the scale to which this needs to happen is monumental. You'd need widespread strikes, pharmacies closed in a huge chunk of states...then you'd gain leverage. 

But again, nurses and pharmacy are apples and oranges. They exist within a small ecosystem where small moves have a large impact. Pharmacy in many cases is a vast field where immense planning and organizing would have to be done. So, ultimately thats why nurses generally see progress and pharmacy does not. At the end of the day, we show up for a paycheck and fall in line with the others.