I think what I'll miss from the SO approach to research is encountering that wall of text someone bothered to post giving a deep explanation of the problem space and potential solutions. Sometimes I just needed the fast answer to some configuration problem, but it was always worth the extra 20-30 minutes to read through and really understand those high effort contributions.
Nobody is writing a wall of text about opnsense rules or unbound checkboxes. I already knew the fundamentals I just wanted to get it done. I'm not a novice I've been using firewalls forever. Xcp-ng for half a decade. I just needed clarification on the differences.