Why exactly do large sensors have more dynamic range

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Why exactly do large sensors have more dynamic range

Many resources(websites) attribute the large sensors having more DR due to they having bigger pixels. But in current days , GFX100 has 3.75 µm pixel pitch and Sony A7Siii has 8.4 µm pixel pitch. And yet GFX100 has higher PDR than Sony by around 1.5 stops.

So what exactly makes larger sensors have more DR.

Or if a company wishes they can actually have FF sensor like A7Siii have more/same DR as GFX 100 but they don't so for some other marketing reasons ?

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