As flaps are meant to reduce stall speed and allow slower approach velocity one can expect additional lift from the extension of flaps. If this lift produces nose-up or nose-down attitude depends on the relation between the lever of the additional lift to CoG. It may appear wise to construct nose-up behavior by means of support for landing, but the balance has been defined by the manufacturer and we simply have to know.
BTW: there is a reason why flaps are nowadays limited to a certain amount and that is - capability of pilots. The more pilots you need, the lower the requirements for them have to be, because not all pilots are brilliant aces. Not every pilot is able to safely go-around with a C172 on 40 degree flap configuration in final ...