This was not always the case in the past, but the Mindstorms EV3 parts have been carefully thought out to let only useful parts available, that is to say parts that are user-separable or movable. Complete shortcuts have been provided to facilitate life, but the user may want to explain in BIs how to pull back the p-brick battery lid and use instead the rechargeable battery pack. In the same spirit, the large motor exists as a complete shortcut for simple cases, but also as a shortcut for the motor case and another for the hub, as the user often needs a motor with hub rotated at weird angle. He may also need a touch sensor with button fully pressed - or only half way...
So before hiding parts from the user, think twice about possible usages
So before hiding parts from the user, think twice about possible usages