<p>It is nothing new, just fixed after it got broken in the mentioned revisions.</p>
<p>Indexing history might not be desirable because:</p>
<ul class="task-list">
<li>it demotes SEO-importance of current (most recent) data </li>
<li>loads the servers with irrelevant, heavy requests, leading to</li>
<li>greater delays with indexing current data</li>
<li>spam/vandalism remains visible even after being removed</li>
<li>possible copyright violations remain visible (although this is not a way to address such issues)</li>
</ul><p>The only pro-history-indexing argument would be that vandalism (eg deleting/changing name tags) would be possible to discover this way.</p>
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