all you have to do is tell each aircraft in succession to 'plan to reach WPT at TIMEZ and xxxKIAS'? Then they can figure out how to do that.
If only it were that easy. Maybe one day it will be that way, but there are so many factors working against us at the moment (air space design, encouraging neighbouring sectors to present traffic, A at a suitable level so that pilots aren't way above profile in the first place, and B to initiate some sort of streaming in advance rather than just transferring everything to us way too late and expecting us to do everything).
Unfortunately the routes I'm thinking of are on a political boundary (I guess that wouldn't be much of an issue in the USA) where there is little or no chance or achieving any kind of change for the better, certainly not in any time soon anyway. Until then we'll continue to struggle to make some sort of order out of the chaos, with everyone frustrated that we're asking them to achieve something they can only just, or maybe can't even achieve in the time/distance given.
