> Then a third type was introduced that required a little extra processing in the middle. We updated the method with

A callback to do the processing?

> a flag

Oh.

> Now... several arguments... probably just a few lines that get run for all the types

Yeah, that does tend to be where it leads when new parameters are thought of in terms of requesting special treatment, rather than providing more tools.

Yes, yes, "the complexity has to go somewhere". But it doesn't all have to get heaped into the same pile, or mashed together with the common bits.