I though era of "more megapixel = better picture" is gone, but apparently not. All that matters in technical quality of cameras is dynamic range. That is related to sensor size, more specific to pixel size that has ability to absorb light. It is simple physics. Those who need camera sensor quality should check this charts: https://www.photonstophotos.net/Charts/PDR.htm
They’re actually binning the pixels back down to the same resolution as before and only using the extra size to enhance sharpness and dynamic range. You only actually get higher resolution if you shoot raw.