Actually we (Zone 8 ) have had Porsches damaged in the same AX area there at California Speedway.
At one Z8 AX there, the curb
WAS the outside of the turn and some light pole bollards were the inside apexes of the turns (no cones - just the light pole bollards). Cutting the apex too fine would have been very ugly.
One very nice new 996 went into understeer in a turn and took out his left front wheel and bodywork going over the curb.
At the same AX, I was instructing a 1st timer (who won his class that day). Coming out of the slalom you headed right for the big brick wall at the end. If you nailed the slalom, you were coming out of it very fast and had to hit the turn perfectly or you were racing right at the bricks.

I was calling for him to brake before we left the slalom but he was so excited by nailing the slalom that he hesitated and we wound up sliding like the Corvette, but luckily we stopped only a couple of feet short of the wall.
Any time the edges of a course are concrete and brick, the opportunities for disaster are there.