Deletions within a thread, when done without an editor's note, now often leave responding statements without a full context, and as a result some responding statements can seem rather incoherent. Those who often browse here might know about the silent deletion practice, but new visitors and those opening a web search result might not.

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Noted. We've aways considered this when we edit or delete, and we post explanations when we think they will be useful - it depends on a number of factors.
-Joe Offer-