Bob Noel wrote:

It's been a while since I've flown IFR, but at KBED, which is
pretty close to KBOS, the mix of aircraft is such that you can't
be sure who will be ready to go first. Thus I figure Boston
Approach doesn't want to know about the guy until he is
really ready for takeoff.


If the controller is competent, it rarely matters who's ready first.