SR71,
There are many different ways to accomplish a safe takeoff calculation; your goal seems to be to use the Maximum V1 so that you only take to the air at the last possible moment. This is a perfectly valid reason but it doesn’t appeal to everyone.
Recently observed on a B777 flight, mid weight where the choice of Flaps 05 or 15 were available, Captain chose Flaps 15, when asked why; he replied that he was concerned with brake fires with higher V-speeds. He therefore wanted to abort from the lowest possible V-speed; his preferred choice would be Minimum V1.
We have operated the A300 for about 20 years with optimized V-speeds, crews hated the idea that for a 1000 increase in takeoff weight, there could be a 30 knot increase in V-speeds, they campaigned for years to have the speed rational changed to Balanced.
So basically there isn’t one easy answer to satisfy everyone. Some airlines do actually give crews min/bal/max V-speeds and allow them to make their own decisions, however around here the predominant mindset that was developed for the Classic B747’s and carried over to all fleets is for lower speeds to aid the accelerate stop.
Mutt.