The idea here was rather to avoid splitting the hair on 50ft-3 deg VS. GP signal VS 300 marker VS antenna anchor,
and instead, share insight on the geometry why PAPI indication for the little aeroplanes like the A340 and smaller will be offset both from the GP indication and the correct visual aiming point (AFM).
The problem of pilot perception is corroborated by ICAO standard marking for LDA2400+ where the big rectangle is painted unnecessarily far down, to allow for the very large planes ( height offset between pilot pilot eye and GP antenna), and the PAPI getting stuck with that displacement.
