What is it about the internet that causes people to double down when they ought to just concede they were wrong and move on?
This whole argument is ignorant. If you don't need or want higher megapixels, just save to one of the formats that has less. But, don't dismiss what others need.
There can even be a demand for a mid- and a high- MP camera in the same bag.Canon, Sony, Nikon, Panasonic etc all do high resolution and low resolution models because there is a demand for both. I am not telling you that you need a high resolution resolution but simply pointing out that there are enough of us who do. It is your biased view that your two cousins bought cameras with too many pixels.
I do need a 30 MP (5 D IV) for most of my pictures, but wish I had a 60+ MP camera for macro. The 2 seemingly contradictory demands exist and sometimes even coexist.