Having a guess as most of the kit I flew was second generation the traffic density wasn't envisaged, no speed controls and fly as low and fast as you want regardless of fuel consumption and noise, hence it wasn't needed. One day actually intercepted 10R ils some 35 miles out and steamed down at 365 knots. The jock captain closed the taps around 3grand and I thought no way, chiltern here we come but around the marker he just heaved the nose so high I could only see blue, dropped everything, followed by a mild bunt and greased it on.
and you tell that to the youngsters and they won't believe you ( greasing it on that is!)