The ISOCELL JN1 is a 50-megapixel sensor with a relatively tiny 1/2.76-inch format, meaning its pixels are just 0.64μm in size?

For comparison, Samsung already broke records in 2019 with the slightly larger ISOCELL Slim GH1, another 50-megapixel sensor with 0.7μm pixels.

Conventional camera wisdom says that smaller pixels usually result in worse image quality with higher noise, so why is Samsung doing this.