One advantage of a live-aboard trip is the option for a 'turn key' trip. You can land at the airport, taxi to and from the boat, and...that's about it. Or nearly so. On the 2 I've done, the closest thing to a complication was the boat returned the evening before departure, and if you wanted more than snacks, you might have to decide where to grab supper in town one night.
It's like the polar opposite of some threads about where to stay & eat and who to dive with in Cozumel. No need to rent a car, drive on the 'wrong' side of the road in Grand Cayman, etc... It's not the preferred option for everyone, but the ease of trip planning can be sweet. If you're just there to dive.
Richard.