Someone earlier on suggested that you're able to pick passengers up by not using short stay, which of course you are.
However, there's still a hell of a lot of private hire/chauffeur services who use short stay and greet their passengers in the terminal - afterall, this is what the passenger pays for.
Now MAN faces enormous queues at the pickup/dropoff points outside each terminal, all multi story car parks full, and all long stay car parks full with the overflow going into staff car parks, which are now also full....
Just where do these hundreds of private hire/chauffeur/individual cars wait for their passengers?