From some of the examples linked to in the original post, and with some ideas from the Help Center article on on-topic questions, I tried to cover all the bullet points that Super User is not about. Note that some of the following reasons might overlap with migrating some questions, but my train of thought is that these reasons can be used for questions that could technically get moved, but would likely be closed as off-topic after doing so anyways (since we try to not migrate crap to other sites :).
- asking for a shopping or product recommendation
Shopping Recommendation
Questions about specific product recommendations - hardware or software - are generally off-topic.
- video games or consoles
- electronic devices, media players, cell phones or smart phones, except insofar as they interface with your computer
Not About Computer Hardware/Software
Questions should relate to computer hardware/software and not to electronic devices (such as smartphones, game consoles, or media players) unless dealing with the interfacing of such a device with a computer.
- programming and software development
Programming/Scripting Request
Questions asking/requesting other users to write code are off-topic, and are also generally off topic for Stack Overflow. Programming-specific questions can be asked on Stack Overflow.
- issues specific to corporate IT support and networks
Commercial/Industrial Applications
Questions on Super User should deal with consumer-level hardware/software, not those used by large corporations. While some specific questions may be on-topic, questions should (in general) relate to software and hardware available for purchase and use in the residential domain. While these questions are off-topic for Super User, they may be on-topic for Server Fault.
The only bullet I have yet to come up with a conclusive reason for is:
- websites or web services like Facebook, Twitter, and WordPress
Largely because we can migrate these questions to WebApps.SE now, but as I mentioned before, I think it may be worth having another off-topic label for those questions which could be migrated (like some of the ones above), but shouldn't be, since they would be closed anyways.