Optimal isn't the right way to think about it. It's a tradeoff. Hub-and-spoke is usually better at getting you to your destination in less absolute time given the same number of total flights since you can have more frequent "shuttle flights" that travel to the hub, exchange goods/passengers, and shuttle back. Point-to-point on the other hand, is better for minimizing travel time since you go directly to the destination.
I heard it’s optimal for staffing though because you can just have people on standby living near your spokes, which would be important if you’re dealing with cancellations, which can severely cascade with point to point
