I doubt that some special syntax like long-form-writing:: would make a difference against technical limitations.
Why? It would tell the software that this document should be processed differently. Logseq was designed primarily as an outliner, not like Obsidian which was designed primarily to handle arbitrary Markdown files. Having a flag to tell the processor to handle the documents differently makes sense to me. But as neither of us are programmers, I don’t see much point in continuing to debate the topic.