Sure, but then he can expect most of his roommates to be easy to live with, as long as he is willing and able to shop around and to change roommates when needed, even if his current roommates are not.
Why can he expect his roommates to be easy to live with? That doesn’t follow.
Also if you think he would have to shop around and change roommates often to find ones who are easy to live with, you are invalidating the point he was trying to make.
