Sure. But you would have had to use either a 3rd party coroutine library, or have written one yourselves to use coroutines.

C++20 provides the language feature only, and none of the libraries to use the feature. You can write your own library to use the C++20 feature, but the standard APIs are raw and brutally complex. There are 3rd party libraries to use coroutines, but they are not part of the C++20 standard.

C++23 provides a std::generator, which is indeed a great feature.

Finally, C++26 provides std::execution, and std::task, which finally makes the feature usable with only standard C++ feature, and provides facilities for executing coroutines on thread pools, or message pumps. Significant features and problems have been deferred to C++29.

I guess it's a fair point that coroutines have not been abandoned. But it's alarming that it will now take the better part of a decade for the feature to reach a sensible state (depending on how C++26 gets handled).