I have nothing to add to the title: Why is the [best-practices] tag not allowed on SO any more?
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It was definitely a bad decision.
I'm just getting into PHP, and wanted to scan through the PHP questions by the best-practices tag so I could ramp myself up on what's current, but it no longer exists. Now you have to hope the text contains 'best practices'.
It would have been a natural if the tag had existed.