Even in nature, almost nothing if ever, is symmetrical. You see eyes that are enlarged on one side, narrower on the other.. Leaves are rarely sized same, as too are branches.
I think enneagram type may have a role. Take an IEI enneagram 6, who may not as much want of an SLE's pressure.. They may want someone more who guides them, taking comfort of a more lenient supervisor or a beneficiary who appreciates of them.. An enneagram 4 as myself may respond to someone better who sees us for who we are and sees us as unique, thus heightening compatibility with a dual..
But I think some relations may be more beneficial than that of others, in comparison to others who have the dynamic. Society values Te/Fi mostly.. If someone is constantly beat up by society over being PolR in such matter, an Fi or te base may seriously help such person who is deficit, in life functioning..
I don't think it is universally equal in what each dynamic is, because equality seldom exists by nature.