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@lae
Presumably to fit the box under the handlebars, and also because a smaller wheel is inherently stronger for given materials/construction.
Although lowering the centre of gravity of a two-wheeled vehicle theoretically should make the handling less stable, not more - the physics behind it is basically like balancing a broomstick on your finger - it's a lot easier with a 10ft broomstick than a 10 inch one. If the centre of mass is higher, you have to move the point of rotation (i.e. your finger on the broomstick/where the wheel touches the pavement) a lot less to get it underneath the centre of mass. If you've ever ridden a penny farthing you'll know how hard it is to fall off one.