I think we’re on the same track.

However you might want to read some John Searle. As you - I think - have noticed, subjectivity and objectivity gets confused due to this input/output thing that you’ve hit on which was why he preferred to split subjectivity and objectivity (and I think we do this without noticing).

For Searle:

Ontological subjectivity is one acting on one. This would be like the subjective feeling that is perspectival. A headache is purely subjective in this sense.

Epistemic subjectivity is one acting on many. When we share our opinions they are subjective but subjective in a different way to the headache because they are broadcast to an audience.

Ontological objectivity is many acting on many. A table is objectively here because many particles act on everyone in the whole room.

Epistemic objectivity is like being unbiased. You takes in many perspectives and then act in a single way..