Put this in the Merc forum but have not gotten much of an answers. Thought I would put it here as well since it’s more about batteries

Was at boat show this weekend looks by at boats and the one I liked was a Lund with a 250 verado. The boat was set up for 2 starting batteries with an isolater between them. One was wired directly to the motor and the other seemed to wired to the power steering pump. Dealer said they have recently been wiring 2 group 24 AMG batteries vs One large one. Is there an advantage with 2 vs 1? Seems like a lot of weight and complexity