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Why did FAR121.191 require a distance between the fix and critical obstruction?

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FAA Regulations

§121.191 Airplanes: Turbine engine powered: En route limitations: One engine inoperative.

(b) For the purposes of paragraph (a)(2) of this section, it is assumed that—

(1) The engine fails at the most critical point en route;

(2) The airplane passes over the critical obstruction, after engine failure at a point that is no closer to the obstruction than the nearest approved radio navigation fix, unless the Administrator authorizes a different procedure based on adequate operational safeguards;

why did the regulation need to request the (b)(2)?

Thanks ahead!

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