A main source of reasonable closed questions that we have are questions that are just below research-level: maybe they're really advanced undergraduate questions, or intro grad-level questions that are straightforward.
Our policy has been to close these questions (maybe with hints in the comments) and recommend that the user ask them on math.SE if appropriate.
I'm not proposing a change in scope to allow such questions. What I'm proposing is that we suggest that these questions be posted on our chat system.
- It allows us to keep such questions 'in-house' without watering down the quality of questions on the main site. This would encourage people who might not otherwise be able to be on the site to participate, and over time they might be able to "graduate" to questions on the main site.
- It allows us to use the chat feature, which has been left unused thus far. Since many of the questions of this nature that people post have quick answers, the chat system enables that quick back-and-forth
- Participation is 'opt-in': since the chat system isn't front and center, there's no danger that people uninterested in answering such questions might be forced to wade through pages and pages to get to the 'research-level' questions.
One fear that we've had in the past with allowing lower-level questions is that we'd get swamped with such questions and that things like reputation counts and question scores would get biased towards answering such questions. Keeping them in the chat system ensures that questions get answered, but this doesn't happen.