Well of course not. If you measure from sea-level then mountains are marked with heights and terrain clearance can be added on top. So once airborne from a field (reading zero) and on a cross country we set a regional QNH via the various radar controllers. That may drift because of changing weather. But when either returning home or landing elsewhere we get the QFE from the ATC at wherever it is.
Avoids having to remember field elevation and subtract while in a circuit.