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Not out of line at all :o).
In an automotive application every component in the system is of known size/fixed. (evap, condenser, compressor, dryer, lines) The charge is predetermined based on the size of these components all being the same. You would charge the system with the predetermined amount (usually printed on a label in the engine compartment). Assuming a PROPERLY operating system, yes its a done deal. I think Superheat and subcool are not methods used for charging in automotive applications because of this. This is why Ive never heard of them.
In residential systems, the mix of equipment size, brand, line set lengths, etc can almost never be predicted. So I guess the charge amount they quote on the condenser labels is for the condenser only? As a result of this, I assume superheat and subcool methods are recommended? Charge weight (for a total system) can not be quoted. You agree?
I agree though that superheat and subcool could be good diagnostic methods.
Either way, I've learned some new terms!