The system has limits (Score 1)

One problem with systems such as this (and there have been several such systems available since the 80's) is that the system can only recommend diagnoses that are in its database. If you answer all the questions appropriately and get a diagnosis with this system and the real diagnosis is not something the system knows about, then you may end up treating the wrong thing.

Additionally, the system will only be as good as the data that was used to create it and must be continuously kept up-to-date.