xiaomi is fighting a previous war, photos only have to look good enough on phone screen and that's it, no one is zooming them to 100% or using them to print 5 meter posters - and if you do, you will shoot RAW and develop it, so all this 'testing' is irrelevant. every single photo in the article has zero artistic value, most of them are a photos of pine tree or a brick wall lol.
that's why samsung doesn't really bother and they focus on software features, updates, stability, dex etc. by the time xiaomi realizes they are 'winning the race' with no one competing against them, samsung and apple will be miles away in the other direction.