while the application of the rule, as when the driver can use it, is open to discussion, and maybe a bit artificial, the moveable wing as such, is not a stupid idea.
Moveable wings or aerodynamics, have been raced in other series, so I would not say, that it is all that bad from a technical point of view.
Reducing drag on the straights, is not such a bad thing - IMHO, that´s while some people came up with the F-duct.
I would agree, that the way the driver can use the device, as it is planned, it´s a bit "artificial/strange", and I personally don´t like it.
On the other hand, it could make for some interesting strategies, as you see sometimes in NASCAR or Indycars when they race in the ovals, and to an extend in Moto GP.
You have to choose, when you want to lead the race, as often the guy who leads into the last lap/straight is going to loose it, because he is just providing the slipstream for the rest.
If the use of the adjustemnt is allowed in qualifying, we may see some interesting team tactics, with team mates providing a tow, like in touring car racing on some tracks. (but I doubt it)
"Make the suspension adjustable and they will adjust it wrong ......
look what they can do to a carburetor in just a few moments of stupidity with a screwdriver." - Colin Chapman
“Simplicity is the ultimate sophistication.” - Leonardo da Vinci