Take a read at this which @BluePanda900 did a very good job on which shows why we cant always do they most relasitic things. He shows a good picture of EGLL with almost 50 planes wanting to push at the same time making it hard to only use 1 runway for takeoff and 1 for landing like they do in real life
Slight tangent, but that is considered quiet day at EGLL in real life…however I do release why in IF that is busy as don’t have the same facilities as the real LHR!
Yeah it is a light time for Heathrow there but like you said we dont have a clearnce delivery or people that know all the roles so it gets hard to control that many aircraft at once even with a ground stop