Newsflash, all children are different!
They are, but they all live in the same society with the same rules about noise, with the same daylight, with the same opening hours and so on.
If your toddler wakes up at 5, and nothing opens until 10am (or 9am rarely), that's an awful amount of hours to fill in and keeping them quiet indoors.
Meanwhile that's a lot of hours wasted in the afternoon and evening when you have to rush home early, have diner in the middle of the afternoon and put them in their bedroom so early.
Again, if parents are happier that way, it's entirely up to them, no one cares, it just sounds like making your life so much harder!
And unlike MN where parents are home by 4 or 5, and the entire family can have tea at 5, most people are working and the kids at school, clubs or nursery at this time!