Is there anything in the articles arguments for operator overloading that would not also apply equally for allowing arbitrary user-defined operators (i.e. infix

Is there anything in the articles arguments for operator overloading that would not also apply equally for allowing arbitrary user-defined operators (i.e. infix functions) instead of the small limited set that is built-in to the language? Personally I'm starting to lean more towards the opinion that infix operators/functions are not worth their complexity even for primitives.