First part of the question is how drivers consider Turkey turn 8 as one long corner rather than a set of separate and distinct kinks. Posted below is a map of the turn, the grey is the track surface and the preferred line is in white.
As shown on the map, turn 8 is a series of four distinct shallow angle kinks. But due to the fact of corner location and width of the track, the drivers are able to negotiate it in one long sweeping corner.
It appears right now that the famous f-duct can be in just one of two states,on or off, and no intermediate levels of adjustment. It's on, or it's off. And when it's activated, the rear wing loses downforce and drag. The loss of drag was the design goal, but the loss of downforce was the penalty it paid.
Bottom line, if you activate the f-duct the rear wing loses some of it's downforce.
In a high speed corner such as 130R, if the rear wing wasn't delivering the downforce required, the rear wheels lose traction, the car comes around and you have a very nasty high speed crash.
Racing should be decided on the track, not the court room.