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If your reputation is on the line for future work...
then the decision to treat any leak as needing a fail safe slam dunk service procedure may well be worth the cost.
When spray painting cars in the past I always had a pressure gauge as close to the paint can as possible... well, close and easy to live with.. this meant on my belt loop for me.. because the pressure specified by the instructions talked about actual pressure at the spray can... so I had my water filter and pressure gauge on my belt 3 feet from the sprayer... it is amazing how much drop in pressure shown at the compressor exists at the time the paint trigger is pulled ( not talking about HVLP systems here) at the point of spraying.... the friction inside the air hose causes a real drop in pressure for an instant when the trigger is pulled....
I see this as the in the same type of situation in the AC system... if you have a clutched compressor like the R4... when it starts up each time... all that has to exist in the AC system is that the friction or availability of refrigerant between the TXvalve and the compressor is enough that the pressure drops significantly... and could in fact be enough to draw air and moisture into a leak in some situations...
Given the cost of fixing a system which refrigerant and oil have combined for long enough to cause acid to eat out some inside part of a metal line and then those particles get carried to some bottleneck to cause serious problems like NO COOLING in Texas heat... a life threatening deal sometimes... I can see a cost/risk analysis which would favor being perhaps overly safe technically in order not to get caught short later on and away from the means to address the situation ' at one's leisure' ...
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