Tomaski
You reaised some interesting points in your original response, suppose I was thinking a departure in a "normal" environment where why change something that's still working OK at 15 degrees/MCT until MSA.
Obviously hot and high altitude/mountainous departures have their own considerations.
We very occasionally do flap 25 takeoffs and have 800' acceleration height - I wonder when I'd start doing the Airspeed Unreliable NN checklist, whether you'd retract flaps - and which is the more reliable airspeed indication(s) to do so? - or are the flap speed limitations factored in so you'd just leave the flaps at 25?
Points to consider, suppose that's why we're paid the (not so) big bucks!!
Cheers.