[jbjorge]

The client doesn't over-fetch, but the server might need to over-fetch from the db with generic sub-optimal queries to resolve all the fields.

Your mileage may vary, but on the project at work where we tried to utilize GQL, it became apparant that it sometimes is incredibly complex to map between a GQL query and an efficient db-query.

We're slowly migrating to REST for preformance's sake. The front-end devs might complain since they can't just write a query to get exactly what they want, but I'm quite sure our customers won't complain about 50KB being served in 30ms instead of 10KB being served in 400ms.