Why they have to launch zelda U and NX on the same day?

[KLXVER]

Miyamotoo said:

KLXVER said:
My question is why wont they show the NX off at a time when all eyes are on them? There is nothing bigger than E3 in the gaming world. Doesn't make sense to me. Are they really going to announce a ND 1 or 2 days before they show it off?

Same reason because Sonny and MS did not revile PS4/XB1 at E3.

True, but they had an E3 after to explain everything.