It is soft but on the bucket mounted switches, the design of the door hinge is such that you would need a rubber pad about 3/4" thick to contact any flat surface on the door side. The radiator support side of the door has a raised round disc in its shape that contacts the switch button so I can see where a thin "~1/4" pad would be enough.
I did contact the owner of that picture and he also sent me a picture of the bucket side switch and it looks like that pad was never in contact with a door. I can see that being the way the door is shaped. The trim tag date on his car is 01B NOR and mine is 05B NOR. Interesting enough my bucket sides don't have the rubber pads and his does. The switch brackets are different shapes between the bucket and FW sides. I wonder if this was an early design and later phased out, especially the bucket side where the rubber pad had no obvious contact when the door was closed. I'm guessing mine was some of the last remaining switch bodies that still had the pad before being totally used up.
Mike