It's not a matter of advantage/disadvantage so much as it's a matter of the spirit an intent. Saving a ball and then falling out of bounds is a part of normal play, and is considered "an authorized reason." Essentially, "momentum" can carry a player out if it was momentum generated during legal activity on the playing court.
Running around a screen or cluster of players is not considered an authorized reason for leaving the playing court, and in fact is the spirit of this rule.
If you don't like it, and are that upset about it, take it up with the committee.
Personally, I don't like it. But I'm not that bothered by it.
