The strategic advantage, by definition, is something you, as a company, don't know what it is. If you know, then people leaving your company take the information to competition and the it's not strategic nor advantage anymore.
So, given that you don't know what makes your company better then the competition, it's better to hide everything you can so you don't accidentally disclose useful information. God forbid competition discover your own strategic advantage before you do.
So, given that you don't know what makes your company better then the competition, it's better to hide everything you can so you don't accidentally disclose useful information. God forbid competition discover your own strategic advantage before you do.