Intruder,
I was referring to the case where you "get off" in 6000 feet, and then have a further 6000 feet of runway beneath you in the 1st/2nd segment climb. If sufficiently Up sloping, this remaining runway then becomes an obstacle to be considered in 1st/2nd segment climbs. It is VERY VERY relevant, and, as stated IS the limiting obstacle for several runways that we operate from. If sufficiently UP sloping, the aircraft would crash back into the runway obstacle during the 1st segment climb. Melbourne Australia RWY 34 is a prime example.
Regards,
Old Smokey