To be clear, the current stance of the Swift project towards this feature is still what Ted laid out in his post from 2019. There's technical progress that needs to be made, and then we can evaluate adding this to the language. Philip's work is welcome, but this is a large feature that will be ready when it's ready, and it is not on the roadmap for any particular release.
There probably isn't a whole lot of point to discussing this feature in the abstract right now. Implementation progress and discussion should really go into a dedicated thread in Development, and nothing is happening on the Evolution front.
@tera, you've made your reservations about adding this feature clear, repeatedly. I think it's best for you to just ignore this thread now. If the feature makes technical progress and comes up for review, you will have an opportunity to give more feedback then.