And makes turnaround much faster since it's already back on the launch pad.
Though it does make it so a damaged launch pad from either an abnormal launch or landing can stop all launch progress until things are rebuilt. We've seen the very reliable Falcon 9 damage the drone ships with a hard landing.
Would be interesting to see more than the two launch towers created to create more redundancy.
They're assuming zero maintenance and all that's needed is refueling. I think if they have any anomalies they'll need to pull the booster to another location for inspection/repair.