We tested it out and made Threaded the default view, but overall our users didn't like it. They missed pagination, and were forced to 'load previous, or load more replies' which broke the flow for them, especially on big threads. So we have it as an option, but the default is linear. We're just in the process of redesigning that page, for both linear and threaded. So here's a basic mock-up of a threaded reply to a post. Just a simple indicator.
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