Jeff Atwood, in 2011, said
This is a "Don't Make Me Think" barrier; we don't want to present closers with a list of 12 different destinations and make them suss out which one is correct. There should be 4 most frequently correct destinations + meta.
You might want to learn more from a more recent post. In such case, please checkout: A proposed philosophy of question migration.
Related FAQ: What is migration and how does it work?
Migrating questions to Software Recommendation.
A question not originally intended to be posted on that site is unlikely to be a good fit for it. Please check out their tour and how-to-ask. If you find a recent exemplary question in Super User that is a good fit for that site, I suggest you discuss the migration of such question As a moderator chatroom. You might have to be prepared to sustain your arguments.
Related
- More options when flagging for migration feature-request status-declined (from 2011)
- Should some communities have more than 4 migration targets? (from 2012)