I don't think it's very useful to [under the "as long as they are not about" point on the on-topic help center page] point users to Super User or Software Recommendations. Those sites are wholly unrelated.
Actually, I feel confident in saying that the above was sort of the point with the phrasing. The help center page in question underwent fairly extensive community back-and-forth right here on Worldbuilding Meta and the phrasing that we ended up with emerged as basically community consensus. (Note that despite several diamonds in the revision history, up through revision 17 pro tem moderators had not yet been appointed.)
The key point in this case is that general software questions are off-topic here. We don't want the "I'm writing a draft description of my world and Word keeps changing my asterisks to bullet lists, how do I turn that off?" because that has nothing to do with the worldbuilding process. Such questions should go onto the general sites, and we helpfully point you in the appropriate direction rather than leave you wondering where such questions might be on topic.
However, some software can be directly related to worldbuilding. We've had a few of those questions, which are more likely to get better answers here than on a general site because of the type of expertise needed to answer them well. Hence, it makes sense to allow questions about software that directly relate to worldbuilding.
Stack Exchange sites aren't mutually exclusive, and aren't really in a competition for traffic. Each site has its scope, which may or may not overlap with other sites. (For example, technically the scope of Ask Ubuntu is wholly covered by Unix & Linux which partly overlaps with both Super User and Server Fault. Each of those sites still serve their niche, all are established and are doing well.) Questions on the network are regularly migrated between sites in efforts to get the best possible answers to the asker's question. If a question is off topic on one site but would be on topic on another, with established sites community members can vote to migrate, and on all sites, moderators are outright encouraged to migrate questions we believe to be on topic on the target site.
Given all this, I firmly believe that helping users find the most appropriate place to post their question is perfectly appropriate. If a question is posted in the correct place from the beginning, it greatly increases the OP's chances of getting good answers, it reduces confusion on the part of the community (particularly people new to the community and site) as to what the scope of each site really is, and it saves time (in our case for us moderators).
For some other sites that directly on the help center page list suggested sites for questions which are off topic on that site, consider:
...and probably others that I can't think of right now.