[fabian2k]

Those are an intentional decision, and using them usually means there is an adult that can open the door from the outside if necessary. Which is a problem if the door can't be opened without power from the outside either. So they're not equivalent.

[toast0]

Setting child lock on doors is an intentional decision, once, and then it stays that way until another intentional decision to unset it. If you purchase a car and the child lock was set, you might not notice it was set.

Depending on the configuration of the car, if you end up in the back seat with the door closed and the child lock is set on all rear doors, it can be pretty difficult to get out.