There's no reason at all to do that unless there is a leak or another problem that requires the system to be opened.
Refrigerant does not wear out or get consumed. The less the system is messed with the better.
I think that it is still valid. The refrigerant carries some compressor oil with it, and it's probably good to keep the o-rings (seals) a little wet with it. I'm sure that some periodic movement is good for the compressor shaft seal too.
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