Bono Vax, you are talking rubbish, it has nothing to do with the airfield, on passing 10,000' you will probably be nowhere near the airfield's control area, as long as your are still inside controlled airspace (nearly always) and descending you can do greater than 250 below 10.
If you need to do 320 kts to get the height off and the a/c ahead of you is doing 250 can soon catch him up. Why do you think that London ATC often ask one a/c to maintain 280 or greater and another to maintain 280 or less. If it made no difference they wouldn't bother!
I often find that JMC often lack consideration of what is going on around them and who is doing what in front and behind them. I am not advocating doing things that will make the crew uncomforatble but a bit of consideration, please?