@ blanning
It could be worse! There was a 386 upgrade for that BridgeBoard that extended the sandwich board even further - might have even blocked a second slot, but I don't recall.
And what's up with designing the motherboard for 16 bit isa slots, then skipping the 16-bit connectors? What were they thinking?
Almost certainly cost. I'll bet engineering had to fight management to get just the 2 16-bit connectors on there.