At the risk of saying something stupid, isn't the security centralised these days?

Ex-schengen gets filterd to the left, intra schengen to the right, but after security the people on the right can still acces pasport control and the people on the left can walk down to intra schengen departures.

Klm uses departure hall 2, but it ultimately wouldnt matter? Even if you end on the schengen side, you could simple walk to the left after security to end up in the right part.

Allowes star alliance ex-schengen pax acces to the lounge if they start in amsterdam