For what it's worth, we support 3.0 because as you note the ecosystem doesn't support 3.1 broadly yet. I'm personally interested to see if 3.1 becomes prevalent

For what it's worth, we support 3.0 because as you note the ecosystem doesn't support 3.1 broadly yet. I'm personally interested to see if 3.1 becomes prevalent before 4.0 is released. Maybe the ecosystem will just skip 3.1? We generate OAS because it's useful for many folks, including for us in Azure. But like you we didn't have very good luck getting high quality codegen from OpenAPI. Our latest client codegen tech doesn't use OpenAPI, we generate code directly from the TypeSpec, which offers a number of advantages that result in higher quality. Probably at topic for a blog of its own! Anyway, you might be happy to know that we are working on bringing our emitters into the TypeSpec project so anyone can use it with their TypeSpecs.