That's kinda what I'd guessed......
A 20 knot wind is only an insignificant 4.76% of a 420 KIAS fast jet's LL navigation speed - but it's 22.2% or nearly 1/4 of the speed of a 90 KIAS puddlejumper's. And highly significant.
Horses for courses....crawl, toddle, walk - then run! (Apologies for mixing my metaphors!).
I think that MDR is an excellent methodology when applied to the appropriate problem. But use of the DC is a core skill which does have its place to play in pilot training. To bin it completely at elementary flying level is rather a mistake, in my view.
I don't apologise for the tone of my original post - if one tosses a pebble into a pond, not much happens. Throw a hefty rock in and all sorts of stuff comes to the surface...
And remember the big red writing at the bottom of the page!