No particularly strong reason—the main thing is that, when building these models, you also have to build a model of the environment that the system is interacting with. And the codebase for helping people build generic environments is mostly focused on handling key-presses and mouse-movements and visually looking at screens, while there’s a separate codebase for handing auditory stimuli and responses, since that’s a pretty different sort of behaviour.
No particularly strong reason—the main thing is that, when building these models, you also have to build a model of the environment that the system is interacting with. And the codebase for helping people build generic environments is mostly focused on handling key-presses and mouse-movements and visually looking at screens, while there’s a separate codebase for handing auditory stimuli and responses, since that’s a pretty different sort of behaviour.