Charge Compensator?

From my understanding, Rheem/Ruud uses something called a "Charge Compensator" in many of their heat pumps. Based on my understanding, parts takes some of the charge out when it heat mode so one wouldn’t need to remove a bit of charge for the heating season then charge again during cooling season.

My question is, what isn’t this thing used on all heat pumps? Is there any drawback to having a "Charge Compensator" and if a heat pump doesn’t have one, would it make sense to add on to any heat pump?

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