So when do we develop this shapeshifting ability? Instantaneously, like right now our adult selves are suddenly able to shift? During puberty as a mark of maturation?
If the first, then chaos would likely ensue for a period of time, right after a number of us survive the heart attacks we have for getting this ability. Dependent on how many quite a few of us wish to explore our darker sides and on how fast we start exploring the capabilities this ability enables.
As an outgrowth that occurs as a function of our bodies’ maturing into adulthood, a race of shifters could be happier because the ensuing cultural shifts would be seen as the natural order of things. We’d probably be more polite for not knowing who we might be dealing with.