Moe is the neotenous anime style that has become ubiquitous since the 2000s. Back in the day some anime actually had more than three ages.
It’s become so derivative and tropic, it’s hard for me to believe anyone likes this drivel but apparently a lot of people just want a nonstop deluge of moe garbage, pantyshots, and isekai power fantasies and they cannot get enough. For an industry thats already about grinding their workers down to dust it sure is sad to see them also choosing to just play it completely safe