The more data that you want to provide the decision making process, the more expensive it becomes to execute, and the more likely you are to need to maintain some form of state.
e.g., rolling windows for types of activities, that's a whole bunch of state that needs to be stored temporarily.
@shlee @dansup @pixelfed
That is to say, the more data to evaluate & more state to consider/store, the slower the rules become to execute, potentially requiring asynchronous instead of synchronous processing