I'm in favour of this for developer-focussed issues. One of the libraries I maintain (http://simplepie.org/) directs support to Stack Overflow, since the majority of questions are basic programming questions (along the lines of "how do I use substr"). I'm usually there to answer SimplePie-specific questions, but those are pretty relevant anyway.
Are there any YouTubers/Googlers here who could offer their insight given YouTube API [1] moved there just under a year ago?
[1] http://apiblog.youtube.com/2012/09/the-youtube-api-on-stack-...
I've seen this in a couple of places of late. Have been waiting for a "don't do this" post from the SO team.
It's a tough position other companies are placing on SO. On one hand you can't alienate a portion of your community by closing all API/programming questions which are of a more proprietary nature just because they're of a proprietary nature. On the other hand, the general trend these companies are starting, to not build out a real support channel, is indicative of developers who don't really understand sales channels which should not be SO's problem. I wish more start ups would get better guidance about support if their products are aimed at developers. Really, they're missing another channel of communication and new business discovery.