As foldr mentions they're a feature, the remainder of the optical system scales quite shockingly in proportion to the sensor. I'm sure there are plenty of furt

As foldr mentions they're a feature, the remainder of the optical system scales quite shockingly in proportion to the sensor. I'm sure there are plenty of further incremental improvements to be made to small sensors, but there are real physical limits on how much charge a tiny cell can capture before becoming saturated. For that reason, even if advancements are made in small sensors, a physically larger sensor with access to the same tech will likely always have a dynamic range advantage