So this is something I've been thinking about looking at widebody seat maps: Whenever a plane is a dual-aisle 8-abreast configuration, it is always laid out in a 2-4-2 configuration, almost never 3-2-3 which would take up the same internal width, just shifting each aisle inward by a seat.
Example: 8-abreast A330 economy class:
Admittedly my knowledge on the most efficient seating arrangements is limited, but wouldn't 3-2-3 be preferable compared to 2-4-2? It would shift the middle seats toward the edges of the cabin, to the windows in the same relative position as a narrowbody, and would turn the innermost seats into aisle seats; all of which I imagine would reduce the claustrophobic feeling of both the middle seats, which are now only one seat away from a window, as well as the innermost seats as they would now have direct aisle access.
I'd imagine this would also not make a significant impact on boarding and deboarding times, since the aisles themselves are the limiting factors as opposed to how many seats are on one side of the aisle. There would be three people coming into each aisle from the window side and only one from the center of the plane as opposed to two on each side, but that would be negligible compared to the time it actually takes to make it through the aisle to the door.
Also they wouldn't need to separately manufacture a four-abreast seat row and can just use the three and two abreast seats they already use on narrowbodies.
The fact that we almost never see 3-2-3 seating in commercial aviation makes me think there's a massive drawback that is completely escaping me. What do you think? Why don't we see this more often and what are the actual disadvantages of this?
Not an expert on this, but I'd assume one thing is that in 3-2-3 two people need to stand up and give way if the person in the window seat wants to stretch their legs or go to the toilet. 2-4-2 only one person has to get out of the way in all situations. Would guess that's actually somewhat important in widebodies since those are used on longer routes, and having to stand up twice as often in the aisle seat would be something of an inconvenience.
There's probably more, I'd guess that would also affect boarding times and so on, but this is the first thing that comes to mind.
Very much this. Think about it from the perspective of selling tickets. If I were shopping for a ticket from multiple airlines, I'd pick a window seat in a 2-4-2 over a window seat in a 3-2-3 every time if cost was comparable. Middle seats are crappy no matter what so I don't see being the middle seat in a row of 3 being better than 4.