User blog comment:MisterWoodhouse/The first specifics on the Unified Community Platform/@comment-32696106-20191019173107/@comment-24171918-20191019191407

This comment function right here is not deleted yet. So right now commenting is still possible. My guess is the function will probably be removed in the final steps of preparing the UCP merge. And when the merge is completed, there will be, according to this blog, a replacement.

Article comments and blog comments are technically all the same, so this applies to blog comments as well.