[anzuli]

Nothing stopping home printers printing at a 45 degree angle, in fact Creality currently has a kickstarter campaign for one called 3DPrintMill.

45 degree printing is very useful for overhangs in a single direction. This is likely why they've utilized it for printing the bow of the boat.

But this makes printing overhangs in the direction of the nozzle impossible, thus not useful in all applications.