The acceleration of the hanging mass is simply given by the simulation. It would be better if students had to determine it in some fashion (e.g. by measuring the time it takes the mass to fall through a known distance). Thus, they are not required to conceptualize or create an operational picture of the experiment and the quantities involved.
The help for the simulation gives a formula that can be used to determine the moment of inertia from the acceleration. If allowed to see this, students will not have to understand or derive the results, leading to a "plug and chug" operation of the virtual experiment.