ALL three A7x are all-in-1 cameras.
And so were almost all digital cameras since 2011.
If there were just the A7, it would be celebrated as THE All-In-One camera.
But then the A7r came, and suddenly A7 became the not-so-good imaging device.
Then the A7s came, and the A7r and A7 became the not-so-good video device.
As Einstein would say, its all relative.