Not so much labeling as marketing. Some sites selling es-12a suggest that no vacuum is necessary, it's completely safe, no need to change oil... etc etc ....

This will attract the least knowledgeable and the least interested people to the product because the literature suggests that it's completely safe and idiot proof.

Sure one can argue that if a pressure switch did not fail, the car wouldn't have caught fire, but in reality had they not used a combustible gas in place of freon, the car wouldn't have caught fire even if the pressure switch failed.

Like I said, I'm not against it, but if people were more aware of the facts, they may make the effort in taking some common sense safety precautions before using it.

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With best regards

Al