If we were to accept Raspberry Pi questions as on-topic, we would be taking a huge amount of traffic away from the Raspberry Pi.SE community. People will find our community instead of theirs, our community doesn't contain much Raspberry Pi questions so people will find the wrong place.
Closing Raspberry Pi questions as off-topic can be seen as wrong to some, but that's just their mind playing tricks on them. It's perfectly right to close someone's question and telling them there is a better place for their question; not a better place for us, but for them; for various reasons:
The user now has access to a collection of other relevant Raspberry Pi questions, those that he would never came across if he wasn't pointed to that fact on Super User.
The Raspberry Pi community now has a question Super User would have otherwise stolen away.
The questions would be answered by multiple owners, and not just one or two users; again learning the user much more than he could ever learn here.
Just because we can keep Raspberry Pi questions around doesn't mean we should.
I don't see why we should hurt them in the long run, even when it's beta, that feels pointless to me...
Some moderators seem to currently be enforcing a personal policy based on their personal thoughts, others are clueless about what to do and seem to leave some questions untouched unless they can be closed under another reason; for an example, see this question which has been closed twice (see the lines with "state" here) which means that at least 10 different people wanted to close that question and 2 different moderators decided to go in against that and reopen it twice.
Why do I think this is happening?
No community consensus has been made on this yet.
Some people house Raspberry Pi under the category "electronic device" (off-topic), others house it under "embedded device" (considerably off-topic) and yet others assume for it to be a computer (on-topic).
Although under that last logic an Android phone running Linux could be interpreted as a computer as well, but that would oppose to the off-topic route we would have for Android and the "mobile devices" (off-topic) policy; oh wait, I could consider the Raspberry Pi as a mobile device as well, just give it some wheels and you have a robot driving around! Or some wings and you have an airplane, the possibilities are endless. But not all of these are answerable by SU...
Some people know about Raspberry Pi, don't want to end up hurting that community; and want t have the question be asked again (or migrated) on that other community instead of here.
So, I ask you to make a community consensus on the Raspberry Pi, answering these questions:
Is the Raspberry Pi in general on-topic or off-topic? Why? Be clear about it.
Which Raspberry Pi questions are to be considered on-topic or off-topic?
Knowing that there is the Raspberry Pi.SE community, do you think we hurt them?