I simply don't understand how anyone can get so excited about all of this.
ATC give you QNH and QFE. You set whichever you prefer.
Away from the airfield of course you usually use QNH; though if I'm teaching half an hour trial lessons close to the airfield, staying on QFE gives me my approx height above the ground, and therefore the height above the villages which might put in noise complaints, so it's very convenient.
Close to the airfield you decide if you prefer to read off your height when in the circuit, or subtract airfield elevation in order to get it. One involves setting the sub-scale; the other some very simple arithmetic.
How can you get so het up over all of this?
Though if you're enjoying the pointless discussion, don't let me stop you (I'm sure you won't anyway)
I need another drink....