I remember the time when transponders were optional. PAL said the same thing now about HUD. While CEB had theirs for their airbuses, PAL just stride with theirs, without...until Airbus placed it mandatorily to newly ordered aircraft. Now they have transponders whether they like it or not. While having no benefit for pilots, It did wonders for AF447 in the Atlantic, and no benefit at all for MH370 when pilots turn it off.
HUD is actually old technology borrowed from the military and started commercial service in 1970. Its actually standard instrument for the B787s. Is this sourgraping for an aircraft they could not have, or diversions on what they ought to have?
Making Sense