flying selected speed and thus going below the GS mini threshold
We used a type of ground speed mini on B707 in mid 1970s.
If we selected Wind + Hold buttons on the INS, it would display Head (N for on nose) or Tail (S for stern) and the wind component in Kts. Large wind shifts were displayed by flashing 8s in the window. The technique employed was not to reduce power when we encountered a headwind gust, but to allow the IAS to increase, knowing we would loose the speed when the gust died.
It was nowhere near as easy as allowing FBW to adjust and simply reading the revised VAPP (with GS mini display).