I'm not sure if it's because they're trying to break it down for laymen, but there's a lot missing from these explanations and their supposed problems. There's no discussion of boundary layers, turbulent vs laminar flow, the effect of wing textures, nothing.

There's also no discussion about what happens when you try and tilt a wing too far upwards - a stall - or why the simple buildup of ice on a wing can cause an otherwise fine wing to lose its ability to produce lift.