Fdev looked at their telemetry and saw that for the last four years most 'explorers' were just traveling in SC in a straight line for 30-60 minutes at a shot after insta-revealing the entire contents of even the most massive systems in the galaxy with a 5-second button press while binge watching their favorite programs on Netflix and decided that wasn't the gameplay experience they wanted to deliver.
That's a good enough reason for me
It didn't insta reveal everything though, it required flying UP to the planets for the info we get via the FSS in seconds. If people prefer flying their spacecraft to do things WHY are you against that as an option? You use the FSS, they use the ADS.