I was at GitHub during their migration to GraphQL, and it was extremely expensive. But they had some weird ideas - there was a mandate to use GraphQL even to re

I was at GitHub during their migration to GraphQL, and it was extremely expensive. But they had some weird ideas - there was a mandate to use GraphQL even to render server-side templates, which meant completely replacing the existing MVC architecture with a sort of fat-model DSL that implemented GraphQL resources. Of course, all of that DSL was developed in-house, so documentation was weak and it was impossible to debug...