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It's not.
Your saddle should be at a neutral angle, so you’re sitting on the middle portion, not sliding forwards on the nose or backwards off the rear of the saddle. The best way to achieve this is to use a spirit level, positioning it from the rear to the nose, and staring with a dead-level angle and then adjusting it if required, depending on the way your ride and your most comfortable position.
If that's true then those fiz ik saddles suck even more than I thought