"Healthy development suggests that an individual may call upon any function in either attitude by a given situation."
— Roger Pearman
It doesn't matter if the author is Pearman, Myers, Nardi, Berens, Hartzler, Haas, Thompson, Quenk, or 17 others, it has always been widely accepted that people can use all of the functions in either attitude. It is only in this forum that you will find people making absurd comments such as, "I don't have Se." We have—and use—all of them. What differs is merely our levels of consciousness regarding their expression in not only ourselves, but others.