What is the purpose of the rock plates under ramps in many maps in StarCraft 2?

Do these little destroyable rocks or plates at the bottom of ramps have any purpose? Is there any advantage to preserving or destroying them?

Cropped screenshot showing destroyable rocks at the bottom of a ramp

Answer

To avoid completely blocking you from exiting your main base with building in early stages of the game.

Attribution
Source : Link , Question Author : Gereltod , Answer Author : gdoron is supporting Monica

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