You're neither blind or stupid - as Nick has said, there just isn't one.
I think role-players tend to stick with RS3 because of the extensive lore (there are fewer quests, etc in Old School) and the appearance diversity (again, which Old School lacks).
I don't know any OSRPers but I've seen this asked before. Maybe there are a few if you continue your search.
Good luck, anyway.
All these sins disguised as blessings
03-Nov-2016 13:40:23