[randlet]

> yet they're implying it's something that anyone could easily do

I don't think they're implying that. In fact they said "It can be impossible if both of you work" which you can extrapolate to "It can be impossible if you're the sole caregiver".

Of course if you are the only person home, you can't expect a 4 year old to let you work uninterrupted for long stretches of time. I don't see anyone trying to argue that point of view though (certainly I would never say that).