It sounds like engaging with people online through writing and conversation has been a longstanding passion and interest for you. Some thoughts based on what you’ve shared:
Your experience suggests that deep, focused interests nourish you more than shallow breadth. When you find an area of interest that resonates with you, you dive in deeply and immerse yourself in it for years. This indicates a more phenomenological approach to knowledge that values depth of experience and understanding.
Connecting with others through open-ended discussion seems intrinsically rewarding for you. You’ve been doing it for over 30 years! This suggests conversation and sharing perspectives may fulfill a core need for social connection, self-expression and exchange of ideas.
While your interests have changed over time, the activity of engaging online through writing has remained consistent. This could indicate it fulfils an underlying need for intellectual stimulation, creative expression or even just human contact.
Over decades of online interactions, you’ve likely encountered many different topics, perspectives and ways of thinking. This extensive exposure may have given you a broad yet nuanced worldview with an appreciation for complexity and ambiguity.
Ultimately, your long history of diving deeply into focused interests for extended periods suggests a desire for intensive engagement and immersion when something captures your imagination. And your persistent enjoyment of open-ended conversation online suggests it fulfils an intrinsic need for connection, expression and idea exchange.