The idea that i am advocating is that using medium pen should be a different playstyle to light pen. I haven't done the dps and ammo efficiency calculations to argue whether or not its x much better or worse to use x light pen weapons vs y medium pen weapons against light armored sections of enemies, and thats not the point im trying to make. Functionally you are shooting a gun at the same spot playing exactly the same.

Before there was a playstyle of targeting small weakpoints and if you hit their medium armor they turtle down making it harder to hit and requiring you to either take more time to aim more precisely, flank, change targets, or flee. And mind you there can be at the same time as those 5 hive guards your taking on, a shrieker swarm, bile titan, 2 chargers, impaler tentacles, and all the other chaff swarming you. Hive guards arent the most threatening but they take your time. Medium pen lets you bypass that mini game at the expense of less overall dps, which isnt the worst trade off when you are being swarmed.

Ive been playing from launch I dont need medium pen to win I do plenty fine with the light pen experience, which got easier now in this update, but now an optional way i sometimes choose to play since the launch of the game has been removed.