Not a silly question at all. In fact, I think it's honest, and a painfully human and beautiful question.
In my experience, Goetic demons are very much intelligent beings, but they are not human beings. That distinction matters. They do not seem to think, teach, communicate, or prioritize things the way humans do.
Could a Goetic demon tell you about other magicians who summoned it? Yes. Would it? That is a very different question, and I think the answer would depend heavily on the spirit, the practitioner, the relationship, and the reason for asking.
In my experience, they tend to focus on the person directly in front of them. If I asked Vepar about another practitioner, I strongly suspect she would turn the question back on me and ask why I needed to know. What part of me was looking outward instead of focusing on my own path? What was I trying to avoid seeing in myself? And yeah, that kind of lesson can fucking sting from time to time.
So I do think they can answer questions in ways we may not expect, but I also think they often drill down into the actual need underneath the question. Sometimes the answer isnt a direct answer. Sometimes the answer is a lesson.
Do they have their own minds? In my experience, yep. The “subconscious” part is trickier, because that sounds like a very human framework to me. I am not sure I would apply human psychological structures to non human spirits too quickly.
Are they full fledged beings? In my experience, yes. They are just not human. They are what they are. How we describe them, whether through grimoire language, psychological language, religious language, or spirit work language, is partly our own framework. But I think we can all land on the fact that they just 'are'.
If Orobas is the one you are interested in, I would honestly bring this exact curiosity to Orobas directly, respectfully and plainly. That kind of honest question can be a very good starting point, as long as you are approaching it with sincerity and authenticity. Where this goes from there for you? Well, that is the really cool part.