Trinitarian Heresies: an observation

As I'm studying the nature of the Trinity, it seems that the explanations posed are often accused of slipping into extremism associated with oneness and threeness simultaneously.

For instance, a social understanding of the Trinity in which the persons are ["merely"] generically united is alleged by some to be tritheistic, yet a corresponding doctrine, the monarchy of the Father, is alleged to be unitarian.

On the other hand, those who claim a numeric unity among the persons of the Trinity is alleged by others to be modalistic, yet a corresponding doctrine, that each of the persons of the Trinity are autotheos, is alleged to be tritheistic.

It is odd at first glance, but I suppose it makes sense if you look at it from the perspective that opposing sides view each other's qualifications as over-corrections for already extant error.