The days of multiple family members using the same computer are long gone. Do you ever log into anyone else's desktop/laptop, or does anyone else ever log into yours? That's what I'm getting at.
A separate account for kids would make this cleanup unnecessary. They don’t want to screw it up for her, they just do what they think will help with their activities.
Yes, actually. My wife occasionally logs into my desktop and vice versa. But I take your point - it's far less common than it used to be, even if it does still happen.