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I have told you why the shops do not do it.
You are the one trying to make why the shops do not do it as ' the subject' when it is not... the question is whether Nitrogen used under pressure with R22 added for a sniffer test agent is the best way to test....and it clearly is... other noble dry gases can be used but nitrogen is cheap... the R22 is LEGAL to VENT... and you should be able to understand the concept of testing the seals in their working direction...
The shops do not do it because they can get by without it... not because it would not be the better procedure.
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