Folks,
Sounds to me like quite a of you know little of aircraft performance in limiting cases, particularly say, US aircraft certified to SFAR 422B, or early versions of FAR 25.
A QANTAS 707-338C, departing the old Brisbane Eagle Farm, at WAT limits, would only have the squat switches release (you could hear the landing gear lever latch release) as the threshold markers passed your peripheral vision out the side cockpit windows.
Likewise a B747-238 with a water injection take-off at Cairns, tailwind component on 33, or the old Athens on a hot night ---- where QF paid to have a couple of trees cut down --- they were below the gradient envelope --- but just in case. In the Cairns case, viewed from the Bushie's Bar, it was quite a sight, lots of red dust blown up beyond the end of 33 --- 15 being out of the question due obstacles.
No early generation jet, east of west, had the performance margins of current certification.
Tootle pip!!
PS: And don't forget "overspeed" Vr for improved second segment climb, then common, not often now needed, even in hot and high conditions.