Anyone familiar with building retaining walls?

Why do I need to ensure the trench in level if I will just be putting in inches of aggregate which I could level without the underlying ground being level? I have watched about 20 videos and have not found an explanation for this.I will be using big box store retaining wall blocks on top of #57 gravel. Highest point of wall is about 2.5 feet but the majority is 1-2 feet. via /r/DIY

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