When they brief the simulator assessment they are very straight forward what they are looking for, how you work together under stress. The flying part is less interesting. The idea with smoke in cabin or a heart attack scenario is for you to safely come back as soon as possible. If you in the meantime keep the blue side up, that's all they look for flying wise. On the other hand, they have a lot of boxes to tick regarding your CRM, captaincy and communications (interpersonal). If the sim would have been about pressing buttons and reading checklist, they could have skipped it since all coming to them have a lot of hours and have done that a few times before...
They want to see that the person they meet in a relaxed interview is more or less the same they see in the simulator with (perhaps unusual) stress put on the crew. We all know that a lot of pilots change drastically when they are under stress. The question is; how do they change? In a good way or bad way.