QUERY: Why should a server ever prefer direct or indirect responses?

[nicowilliams]

For that matter, if a user-agent could request a preference or requirement for direct vs. indirect responses, why should it prefer one or the other? That is, what guidance can the I-D give for when to use direct responses and when to use indirect responses?

Indirect responses have the benefit of allowing the user-agent to get a URI for its query without executing the query, and then also any subsequent GET of that URI will be cacheable as usual. Whereas direct responses mean executing the query immediately.