I think it's generally under-appreciated how much of ancient Orthodox and Catholic theology is about Theory of Person. Intriguingly, this makes a lot of this theology falsifiable.

There's a reason for this. The primary objective of ancient Christian theology was to make sense of the person of Christ.

This was theoretically very difficult, and required intense thought around what a person actually was.

Arguably, the modern concept of a person emerges from this dialogue.

The core assumption of Christian theology is that Christ is a single person, despite being both divine and human. This requires defining "person" to a great degree of precision, and those definitions apply to human (and non-human) persons alike. https://twitter.com/DocAyomide/status/1312488153236688897?s=20

That makes them testable. Particularly when they make statements about the relationship between persons and wills, natures, etc. https://twitter.com/micahtredding/status/1312489883299004418?s=20