The section still most definitely needs some undulations and surface features--a perfectly smooth section wouldn't match the character of the whole track. I like our smaller "motorsport ranch" track nearby because it is "worn" and challenging to drive, otherwise, because it was built in a flat coastal plain area, it would be very boring.
On the other hand, driving the new Circuit of the Americas is smooth and fluid with a lot of elevation and camber changes... but it can get a little boring after a full track day. It's also very hard on cars, brakes, and tires for different reasons--very high speeds, a lot of g-forces, and very hard braking. Its not surprising to hear that someone broke a suspension or frame component during a track day.