GraphQL is great if you're a frontend developer. REST is great if you're a backend or infra developer (not because of complexity of developing it, because of complexity of using it)
You cannot satisfy both with one tool. Migrating to GraphQL (or choosing it in the first place) will frustrate consumers of it who primarily use your API for things other than writing frontend clients. Using REST will frustrate people who use your API to write frontend clients.
You cannot satisfy both with one tool. Migrating to GraphQL (or choosing it in the first place) will frustrate consumers of it who primarily use your API for things other than writing frontend clients. Using REST will frustrate people who use your API to write frontend clients.