You can indeed optimize FQL queries more than GQL. I’m not certain what you mean with redundant, one GraphQL query results in one FQL query (e.g. no N+1 problem How Fauna's GraphQL API Solves the n+1 Problem). The amount of reads of that one query however can be more optimized with FQL. You might be interested in this forum post:
What are pros and cons between FQL and GraphQL?