Well, it's more than just being polite, of course, but communication is pretty important in business.
I always go back to the interview with guys from Bethesda and Gearbox. They said they'd been in constant contact with Microsoft and Sony. They were given updated information about the new consoles and were even asked for feedback. Nintendo, on the other hand, was like, "okay, here it is, k thx bye." The response from most western developers was a collective shrug.
That's just not going to work. It's not. No competent business runs things like that.
Would it necessarily change things? Honestly, I don't know. It is, however, a damned good place to start. IF Nintendo wants third party support, which they were obviously aiming at with the Wii U, then you can't skip that and expect to do well.
We know they had communication with EA (remember the unprecedented partnership?) and look how that turned out. We also know that Nintendo did talk to some third parties about the specs of the Wii U (we have that testimony from Team Ninja and Gearbox and it can be assumed that they weren't the only ones: http://www.gonintendo.com/?mode=viewstory&id=171023 and http://nintendoeverything.com/gearbox-nintendo-has-listened-to-wii-u-feedback-controller-specs-will-be-awesome/). We only know what we have been told and from what I've seen, Nintendo did take a lot of steps but not many third parties really cared.