I think the main reason people don't do things the right way from the beginning is that often they have no idea what that would look like. At a guess, I suspect you'll find out that there's a simpler way to do your methods that take many arguments (fluent interface? builder?) and return complex responses. I code with a simple principle: if I have to spend a lot of time explaining it, it needs to be rewritten to be simpler. KISS and YAGNI are actually polar opposites.