In .NET 11 C# async management moved to the runtime, mostly eliminating heap allocations and also bringing clean stack traces. You really only need to think about ConfigureAwait(false) when building shared libraries or dealing with UI frameworks (even there you mostly don't need it).
You speak in the past tense, but .NET 11 is not released yet at time of writing. Runtime-async is not the current reality.
True, it's in preview currently, but actually .NET is already very efficient with async today also - https://hez2010.github.io/async-runtimes-benchmarks-2024/ (.NET9 tested here).