I imagine introducing baffles would significantly complicate unloading, as right now the procedure is basically to lower bulldozers and other heavy machinery in

I imagine introducing baffles would significantly complicate unloading, as right now the procedure is basically to lower bulldozers and other heavy machinery into the hold and use it to keep the cargo in few piles that can be easily grabbed by a crane. Liquid transport doesn't have the same problem since you can just pump the cargo out.