Apart from the already discussed issue of the Estimate passenger number which is always ignored, which is in fact a bug that we'll fix soon, it seems you were expecting something different from Auto Mode.
Auto mode doesn't call the whole of GSX for you, because you might have reason for not wanting to *start* GSX automatically.
Instead, if the Auto Mode is enabled, it will be triggered by either BOARDING or DEBOARDING. Calling another service will revert to the old manual mode, and this is exactly how it's supposed to work so, if you want to have more control in one session, you can do that, without having to constantly changing the option.
And, even on Auto mode, it will still your responsibility to start Deboarding.
If you start with Boarding, Auto mode will call baggage loaders, then Refueling and Catering. You will have to call for Departure.
If you do Deboarding, Auto mode will call baggage loaders, then Refueling and Catering. You will have to call for Boarding (which will proceed in Auto mode as above), then you'll have to manually call Departure.