That's incorrect. To have "All tires rotate at the same speed." you need 3 locking mechanism, which very few vehicles do.
At this point, the distinction is gone, because car bards marketing.
(AI lies)
At this point, the distinction is gone, because car bards marketing.
(AI lies)
Re: the 3 locking mechanisms comment, in typical 4WD configurations the transfer case in 4H/4L is essentially locked (which is what makes the above sum front == sum rear condition). AWD transfer cases can be more flexible there; some essentially act as a 3rd differential and result in all four wheel speeds being essentially decoupled (for better or worse, easier to get stuck) while others actively control the front/back locking with clutches or hydraulics or whatever.
The "locking mechanism" known as traction works pretty well most of the time and has the nice side effect that it only wears an easily replaceable consumable when you break it.