1. A Raspberry Pi is a computer. Super User is a Q&A site about computers. Therefore, Raspberry Pi questions are on-topic. I think that's pretty clear.

2. All Raspberry Pi questions should be considered on topic. Why? See answer to question (1). Just because a question could be on-topic elsewhere does not mean that it must necessarily be off-topic here. If the sole reason for a topic to be off-topic here is because there's a specific community for it elsewhere, it should not be off-topic here.

Part of the reason for this is that it is the user's choice where they want to ask their question, so long as the question is appropriate for that site. If I want to ask a Raspberry Pi question on Super User, I am perfectly within my rights to do so, and I may not want somebody else telling me where to post my question. Same goes for Apple computers, Ubuntu questions, Unix and Linux questions, etc.

3. Knowing that there is a Raspberry Pi beta site on Stack Exchange, I would very much like for them to succeed. And you know how a beta site on the Stack Exchange network succeeds? Through growing its own community organically. That happens by attracting interested users and by growing the community "from the ground up". There are examples of Stack Exchange sites that were "seeded" with content from previous sites, and in almost all cases, that has resulted in an overall weaker site.

If we want Raspberry Pi to succeed as its own Stack Exchange site, which I expect it will, then we need to allow them to grow without sending them all of the questions that end up here. Forcing all of Super User's R-pi questions on the new beta site is what hurts the new site, and our own.

As an addendum, I would like to add that it is a general Stack Exchange policy not to migrate questions to beta sites unless the question is entirely off-topic on the originating site and entirely on-topic and welcomed by the site targeted by the migration. A policy of closing R-pi questions on Super User would be illogical, since there is no normal migration path to that site, and if the site does not graduate from beta, those questions would then be effectively gone forever.

1. A Raspberry Pi is a computer. Super User is a Q&A site about computers. Therefore, Raspberry Pi questions are on-topic. I think that's pretty clear.

2. All Raspberry Pi questions should be considered on topic. Why? See answer to question (1). Just because a question could be on-topic elsewhere does not mean that it must necessarily be off-topic here. If the sole reason for a topic to be off-topic here is because there's a specific community for it elsewhere, it should not be off-topic here.

   Part of the reason for this is that it is the user's choice where they want to ask their question, so long as the question is appropriate for that site. If I want to ask a Raspberry Pi question on Super User, I am perfectly within my rights to do so, and I may not want somebody else telling me where to post my question. Same goes for Apple computers, Ubuntu questions, Unix and Linux questions, etc.

3. Knowing that there is a Raspberry Pi beta site on Stack Exchange, I would very much like for them to succeed. And you know how a beta site on the Stack Exchange network succeeds? Through growing its own community organically. That happens by attracting interested users and by growing the community "from the ground up". There are examples of Stack Exchange sites that were "seeded" with content from previous sites, and in almost all cases, that has resulted in an overall weaker site.

   If we want Raspberry Pi to succeed as its own Stack Exchange site, which I expect it will, then we need to allow them to grow without sending them all of the questions that end up here. Forcing all of Super User's R-pi questions on the new beta site is what hurts the new site, and our own.

As an addendum, I would like to add that it is a general Stack Exchange policy not to migrate questions to beta sites unless the question is entirely off-topic on the originating site and entirely on-topic and welcomed by the site targeted by the migration. A policy of closing R-pi questions on Super User would be illogical, since there is no normal migration path to that site, and if the site does not graduate from beta, those questions would then be effectively gone forever.