I recently flagged a question to be migrated to Raspberry Pi.
But it was declined with the following explanation.
don't really migrate to betas to allow them to organically plant their feet
I really don't think that this applies in this situation though as the Raspberry Pi site is currently 49 days into public beta. While the question was asked yesterday.
If this question was asked three months ago, before Raspberry Pi entered public beta I could see, and would even agree, with the reason behind it's decline.
However in this case, we have a brand new question asked on site A when it is more relevant to site B. Why not migrate it?
The same approach is taken with Code Review and Stack Overflow. Stack Overflow migrates questions that are on-topic for Code Review to them, even though they are still in public beta.
In conclusion, why not migrate?