In the real world, the air molecules are not moving over or under a wing. They are simply sitting still, or wandering around gently, having a great day - until suddenly some metallic object whips past them: "WTF was that?", they say. The ones above got squished up together, the ones underneath not so much.
So the air molecules are not 'trying to equalise their speed over the wing' they are sitting still while the wing is doing the moving past them and pushing them up or down.
Most wind tunnels, of course, move the air molecules while keeping the wing static, and I wonder if this is where the confusion arose?