@BOAC:
I may have misinterpreted then:
the designers expected (not unreasonably!) the a/c to be 'on the ground' at 60kts or less and therefore designed the software to close the warning
As you seem to be equating the AoA <60kts inhibition with being on the ground as a design feature, when it is not. It is an implicit side-effect of the design, but it was not intended to apply only on the ground.