It's near impossible to make ugly photos in Tanzania, even with low-end skills or gear. The subjects, scenery and light conditions are naturally very beautiful on their own. The output will be visually attractive and you'd not easily notice any lack of technical attractiveness.
Compare this to photographing technical test charts or you walking the dog at night. As the subjects themselves are unexciting, it would be better suitable to analyze technical image quality.
Another interesting aspect of analyzing the quality of mobile photography is that counter intuitively, mobile phone screens are drastically superior to most desktop monitors. Mobile screens increasingly are OLED for deep contrast, wide gamut for richer colors, and have a pixel density that is a multiple of desktop screens.
Most photos taken on a mobile phone completely fall apart when viewed on a big screen, as it then becomes obvious how much of a smudge they are.
That said, we've come a long way, and I am impressed.