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Things like this make it really hard to follow a discussion as it evolves over time.

Yes, there's some churn, though we do what we can to minimize it, e.g. posting the URL change in the thread. But the benefit of switching to original or better sources is greater than the cost of the churn. Discussions gradually become higher-quality. Also, not switching to original sources also creates noise in the threads, e.g. complaints about blogspam.

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