drivers need to stand up at full height inside for ease of use
drivers, when seated, need to see very close to the ground what is in front of them
drivers are not all the same torso height. Men are usually taller than women so you need a really tall windshield for very tall seated drivers, and very sharp and short hood for very short drivers.
Its ugly, but is a very VERY functional design. I’d rather mail carriers are comfortable in their ride than feeling stylish.