This is what I wanted to say too. If your backend team is incapable of rapidly adding new endpoints for you, they probably are going to create a crappy graphql experience and not solve those problems either. So many frontend engineers on here saying that graphql solves the problem they had with backend engineers not being responsive or slow, but that is an org problem, not a technology problem.

Yup. And the solution to that org problem is for the front engineers to slow down, and help out the "backend" engineers. The complexity issues faced by the back-end are only getting worse with time, the proper solution is not adding more complexity to the situation, but paying down the technical debt in your organization.

If your front-end engineers end up twiddling their thumbs (no bugs/hotfixes), perhaps there is time (and manpower) to try to design and build a "new" system that can cater to the new(er) needs.