I think 3 comments here are really spot on.
1. Supports: it is far cleaner and easier to support a drop that has an arch shape.
2. Pull out to drop ratio: the steeper it is, the less time it spends free falling and the longer it spends pulling out. The 80-85 spot gives a really long time of downward curvature which looks more intimidating to gp.
3. Aesthetics, the supports and shaping would look awkward so this ties in with the previous too.