I've been using optional parameters for decades (Oracle PL/SQL). Thankfully later in C#. My argument in favor of them is to reduce copy-paste functions created under the guise of polymorphism (function overloading). f1(arg1, arg2,arg3) { do work } f1(arg1,arg2) { f1(arg1,arg2,'z') f1(arg1) {f1(arg1,'y') instead use to replace all 3... f1((arg1,arg2='y',arg3='z') { do work } Cleaner, less to maintain, ... But, I understand your points. It is an opinion thing. I really appreciate using them in the (what I think) is the right situation.