I'm fine with there being adult trans characters in kids characters. It's when they push the idea of there being trans teenagers and children that seems out of whack. They haven't even fully developed yet, how would a thirteen-year old feel like the wrong gender when they've barely been alive long enough to know what it means to be their current gender?
Like some of the staff trying to push Princess Marco as a trans icon. Marco never felt like a girl, he was just simply fine wearing a dress like it was a normal article of clothing. It's insane to think that because a guy isn't humiliated wearing a dress, he must deep down feel like a woman inside. Severely misguided fire.