I used to keep an eye on the groundspeed during the approach when flying the DC10. In strong headwinds it felt better with a higher TAS to keep the groundspeed at something above 130 knots. Inertia is presumably relative to earth - you wouldn't want the wind dying a death. And then lo and behold I go on the Airbus and they've spent a few million fitting a device which does what we did all along. Its there for a reason and I flinch every time the other guy goes selected speed, brings the TAS down and sits a few hundred feet above the earth with a GS of 100. We haven't crashed yet so I could be wrong.