I know, that previously those "withMethods" have been implemented, but nobody ever gave me a reason why the "setMethod" should not return the object directly.

Feel free to avoid that redundant "withMethod" and return the object when calling the "set" method.

To my knowledge, in functional programming, it is generally referred to as with. The true meaning is to create a new object and return it without modifying the object itself, but here, with modifies the object, so set and with are indeed duplicates at this point.