I'd say no small part of it is keeping people in the ground.Re: 2/ It is something to think about, how they'll avoid kettling the crowd through that wall as they all leave after the game. But I guess it's all been passed by planners etc. It's been a thought whenever i looked a the plans though, and seeing it built hasn't changed my mind so far.
as in,
" the exits are mobbed, I'll grab a drink or go to the club shop or one of the food trucks in the fan zone till it clears out a little.
There'll be an initial teething period while people get used to arriving and leaving the ground but it'll all level out