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Points 2, 3 and 4 are irrelevant here. Do not use IDs in CSS. Use them in markup and JS and tests, sure, just not in CSS.

Point 1: The speed difference between a class and an ID is so, so slight that it's almost non-existent. The specificity difference between a class and an ID is massive.

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If a given ID element is uniquely styled (a very common use case), it seems backwards to me to explicitly give it a class so that you can select it by class instead of by the ID that already exists.

blather all you want, but the consensus here is IDs, when properly used, enable speed and specificity. you don't get to tell us what's best practice.

Ah yes, the almighty consensus has spoken. Dare not disagree or we shall smite you.

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