I'm not sure what's puzzling about a feature, which people have asked for, for years. Apple does listen, when enough people ask for something and over the years, many many many people, including me asked for the emoji's to be larger. So Apple listened and made them bigger.
What I find puzzling is how many people get upset over change. They're larger. That's all they are. They're easier to see now. They didn't take any emoji's away. They didn't change how emoji's work. They simply made them larger, which for me is a really great things.
Feel free to do what I did long ago, when I asked for larger emoji's and what I have done recently, when I THANKED Apple for making them larger - FINALLY and provide feedback to Apple here, where it will be read by Apple --> Feedback - iPhone - Apple