>>106588331
Because your S23U has a 10MP 3x and a 10MP 10x.
Meaning for 4x through 9x zoom levels, you're digitally zooming on a 10MP sensor.
On the S24U you have a 10MP 3x and a 50MP 5x, this means at 4x you're still doing a digital zoom on 10MP, but at 6-9x you're now doing digital zoom on 50MP (and through a 5x optical lens instead of a 3x) giving higher image quality than the S23U.
So the S24U sacrifices some minor zoom quality at the high end, for MUCH better zoom quality at the lower end, and since MOST people are only zooming in between 1-10x, the S24U should beat out the S23U in every zoom range, except for 10x.