Capn Bloggs:
I understand that airspace steps can be an issue if you are on the GS when hot or cold. GAATE and HUNDA are obviously not terrain limits.
The GS is not controlling until LIMMA. Further, the GS remains at the same true altitude both outside and inside LIMMA.
So, outside LIMMA on a hot day the step-down fixes rise above the GS. The step-down fixes separate traffic below, not the GS. This has been an issue at LAX, SEA, and ORD.