Quote (Uguu @ 27 Aug 2014 10:56)
I feel like lightning bending back then can be taught to all fire benders, it just wasn't because it was labeled as high society/social standard for the royals
And when Zuko became fire lord, he allowed everyone to learn it to, to advance the society in general
Yes, that's exactly how I saw it. It's the same with metal bending, it's probably more a question of your personality and mental state, but on top of it until Toph, it was rare enough to see someone figure it out that it was considered impossible.
Think of Bolin, he's not though and unyielding like Toph, he's more of a burning temperament, so lava bending, which is probably requiring a flexibility and adaptability that most earth benders don't have, is far better suited to him.
I'm guessing this wrong obsession with power and talent as a prerequisite is part of the reason these were so rare.