Slam and whirlwind (and shield slam) are rotational abilities by their very nature. If there’s no reason for a given spec to use them, then there’s no reason to have them.
The purpose of this unpruning should absolutely not be to fill an action bar for its own sake. Even if it’s not every combat, there should be a reason for a spec to use every single one of these abilities. And for the most part, that’s the case. But for these three attacks, the water is muddy.