CanonicalQuery is (roughly) our current logical plan for find() queries. It should be possible to create one without going through FindCommandRequest. (It seems like a layering violation: commands are messages that clients and servers use to communicate; CanonicalQuery is a lower-level, more internal, more normalized representation for a query.)

It looks like CanonicalQuery only depends on FindCommandRequest out of convenience: many options happen to be shared between them, so CanonicalQuery exposes one large getter instead of smaller separate getters. While convenient, this makes it harder to see which information a CanonicalQuery contains or does not contain.