Is GraphQL having a single endpoint a bottleneck?

I'm trying to understand if GraphQL is a good architectural decision for large-scale apps.

One thing that caught my eye is the fact that it uses a single endpoint for all requests.

From http://graphql.org

Access the full capabilities of your data from a single endpoint.

Is this a bottleneck? Where all requests go through a single API Gateway (a single endpoint)?

Asking for a friend. Thanks.

EDIT: Pointing me to any documentation that addresses this would be helpful.