The lighter perspective.
I am just a humble light twin PPL and am interested to see the points of view outlined here.
One understands why a commercial set up would like to expedite departure (fuel saving, time savings, slot availabillity) and with all the thrust available to modern jets it is clear that this the sensible approach.
One earlier poster mentioned Manchester and the light stuff being in synch with the big commercial traffic. I used to fly out of Cardiff and would accept an intermediate hold point and departure if the numbers clearly indicated that I had more than enough margin to get up and away safely within the regs (never a problem there).
However I still feel better if I know that I have enough runway to land straight ahead and preferably still come to a stop if something goes bang on take off. The margin between climbing on one engine and descending in what I fly is often very small and without the luxury of all that additional thrust, runway ahead is not to be sneered at.