A lot of agricultural products have been designed for being useful for a wide range of processed foods rather than for direct consumption by the public. Or they have been designed for shelf life and appearance rather than taste or nutrition. Examples:
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Jalapenos that aren't spicy.
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Watery tomatoes.
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Orange juice concentrate.
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Corn for corn syrup.
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Old garlic / topped garlic.
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A near complete absence of fresh herbs but a huge amount of dried.
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Worse limes (key limes are way better but the ones crossed with lemons are ubiquitous because they have better shelf life).
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An absence of seasonal produce in general, replaced by year-round bland stuff.