Please try not to take everything so personally, GP. I will try to do the same. You are correct, I misread your statement of generality. But you should be more careful to use transitions when you move from a response to an individual to generalities. When statements are juxtaposed without a transition, a relationship is implied.
You have to remember that you're talking to people like me who tracked games like Twilight Princess and Super Mario Sunshine for years before release. It's what video game journalists, and most enthusiasts, are used to. Not getting that is naturally unsatisfying for me, regardless of whether being tight-lipped is the smart thing for Nintendo to do from a business perspective. You can criticize and try to break apart this sort of mentality, but sometimes emotions/deeply ingrained expectations just don't appeal to logic.
I'm not sure this is an example of Nintendo being tight-lipped about upcoming releases, but I can think of at least one game where not showing has hurt them: Wario Land Shake It at E3. I understand every publisher had tragically limited space constraints last year, but there's no reason why Wario shouldn't have had a single station on the showroom floor. Almost no one saw or played it because it was restricted to private, scheduled sessions. As a result, negative/incorrect assumptions surrounded the this fantastic title and surely tainted some reviews.