Humans have the ability to rationalize anything they set their minds to. There is no single recipe to shooting success so thumping on our chests that there is only one true path to casting/reloading/shooting success is narrow-minded and silly. IMHO, of course.
Yes, I do PC but only to tweak certain CB's as I am too cheap to buy custom molds for some of my rifles. Naked alloy and "grease" works for most of my pistols and rifles and I have no "need" to change these combinations.
PC is but another tool in my toolbox that allows me to enjoy my hobby. PC-only zealots don't impress me much.