Child-like characters?

[WrenElessedil]

But SE doesn't like the idea of creating playable children and thrusting them into violent situations where several people are actively trying to murderize you. Remember the entire MSQ and think to yourself that you wouldn't be horrified if a child was doing those things. "Hey lets send this kid alone into the bowl of embers to fight a god because he has the echo and we don't."

This is the most sensible reason, but I'd say not because people in the real world would have problems with the violence toward children but that people in the game world would. The MSQ isn't going to happen when the quest NPCs refuse to send a 10-year-old on a dangerous mission.