Ok, so the main point of this thread is "How shit is Nintendo amirite??!!"
I'm not going to address that, because there's a more important thing to address, the argument that if Nintendo aren't holding a traditional E3 event, then they aren't holding an E3 event.
Now, we could think up many reasons for them wanting to have non traditional events. The most likely one to me is that traditional E3 events are ok if you want to announce games and show a few minutes of gameplay footage, or some cinematics. But Nintendo has a lot of games that are further along in development than that.
Instead of having one event where they have to squeze in so much different stuff, they can have multiple.
One event can focus on investors, recognising the problems that Nintendo have encountered this gen and how they are going to be fixed.
One event can be announcing some 3DS stuff, probably for launch 2014.
One event can be just to give as much in game footage/demo playtime as possible to smash bros, mario kart, 3d mario, WiiU zelda, wii fit u, Shin migami v fire emblem and yarn yoshi.
And then an event on 3rd party partnerships if they want.
tl;dr, you are looking for the negatives.