Lol, accepting your 'tradition' argument (I don't) any such traditions would be overturned by the very statute you cite.

"3426.8.This title shall be applied and construed to effectuate its general purpose to make uniform the law with respect to the subject of this title among states enacting it."

That's the law. It overturns everything prior. All commonlaw interpretations (the closest legal thing to tradition) before it are void in the face of this new law.

Fyi. California's law is actual a cut-and-past of the Uniform Trade Secrets Act as adopted by basically every other state in the union. See https://en.wikipedia.org/wiki/Uniform_Trade_Secrets_Act.