There was quite some controversy about combat ships requiring an FSS module to find things (mission targets).
Before that there was quite some controversy about not seeing the system map in the bubble from players only wanting to do missions and other non-exploration things inside the bubble.
It was bugged. Basically you could still honk and use the FSS without an ADS installed in the beta. It looked to me that it was easier to just remove the ADS and have it as a built in module.