I noticed that many questions related to Scrum, Agile and other related tags are often closed on Stack Overflow as off-topic and migrated to programmers.stacexchange. Should we simply migrate whole these tags to programmers.stackexchange? I don't see too much point in having half of questions on SO and half of questions on programmers-SE. Also it would be nice to somehow notify users when asking new questions with these tags that they should ask it on programmers instead.
I'm against wholesale migration of questions from one site to another (regardless of the sites involved). As I explained in my answer linked to by marcog each question must be judged on it's own merits.
A wholesale migration would migrate bad questions along with the good as well as inappropriate questions that were badly tagged. Closed questions could be ignored, so they're not an issue.
No, it is not that easy, as a question may include how to write unit tests etc
Similar and more general question was asked today. Responses provided in that question answer my question as well.