This would be a bold step.
Justification: the new mongoc_collection_find_with_opts has many advantages over mongoc_collection_find (
CDRIVER-1522). Its API is nicer, and easier to use correctly, and it closely matches MongoDB 3.2's "find" command, whereas mongoc_collection_find requires the old OP_QUERY syntax with $-modifiers and old names like $orderby and $query. Soon this API will be a relic of an obsolete server, let's plan to remove it from the driver.