If posting the widely accepted definition of an rpg isn't helpful, then I don't know what to say to that. That's like telling me that it's not helpful to classify my books into fiction and non-fiction because the categories are too broad. Yes, that's why we have sub-genres.
There's some overlap between the rpg and adventure genres. Telltale games like the Walking Dead or Wolf Among Us are adventure games, not rpgs. Maybe it's confusing because everyone seems to have a different idea of what constitutes role playing over adventure.
