Our close reason for questions that ask for recommendations states:
Questions asking for recommended external websites, tools, resources, and software are off-topic as they tend to attract opinionated answers and spam. Recommendations for software are permitted on Software Recommendations, but be sure to read their quality guidelines before posting there.
I have a user that is asking for documentation about where we decided that each of those recommendation categories is off-topic:
I'd like to find the meta discussions relevant to each one, or if meta discussions don't exist, create documentation here.
If appropriate, should we modify the help center to better match the wording of the off-topic reason?