Are you trying to make us believe the refrigerant gas acts as a lubricant and therefore degrades over time the same as engine oil? Really?
The air in the tyres is much closer to the truth ...
Periodical air con gas replacement is a rip-off - it's a fix on fail component to a car unless you...
That's a crap analogy if I may say so.
The engine oil has to maintain a film of separation between fast moving metal parts so is being worked hard - thus failing to renew this is putting an expensive engine damage scenario as a possibility.
Perhaps a far better example is "Would you replace...
My VW on a 58 plate - sill blowing out chilled air with AC on - nothing to "fix" here ....
I recon the gas in my AC is like the gas in my tyres - no need to replace it, but if it's all leaked out, then it's time to get it fixed ....