Ah, yes but....
I have read this thread with great interest, both for the entertainment value and for the more important purpose of understanding the mathematics and physics involved in flying.
However as a PPL(A) I line up, apply full throttle and then check that the static rpm is at the correct level and constant, the airspeed in building in line with expectation, apply slight back pressure and finally check the “feel” of the a/c. At say 65-70knts depending on type I rotate.
I was not taught not do I feel the need to necessarily worry about what speed I should have achieved at various points along the runway. I am more concerned with the weather conditions, the take-off weight and take-off configuration.
May I just say again however, that notwithstanding the above, this thread of very interesting and informative and while it may not change the way I fly, one of the fundamental joys of learning to fly in the first place was the learning curve.
Please, before anybody shoots me down, I am incredibly safety conscious, aware of my limitations and certainly not arrogant enough to accept that I have learnt something from this thread.