User blog comment:MisterWoodhouse/The first specifics on the Unified Community Platform/@comment-32696106-20191019173107/@comment-24171918-20191020124655

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MisterWoodhouse refers to blogs themselves, not blog comments. All comments, whether they're article or blog comments or forum or message wall posts, use the legacy system that will not be supported in future anymore. On the other hand, there are Discussions, which use a newer system.