fascinating different point of view on why chauffers were not given the comfort of an enclosed cab

Remember, it started with wagons. 

Drivers mucked the stalls and did other messy and smelly things. Trapping them in an enclosed space would be a bad idea

At the turn of the century when cars were invented, there was little indoor plumbing, so taking a hot bath didn't happen often, and even wealthy people barely bathed. They got clean undergarments more often, but relied on powders and perfumes for odor control. 

So, the theory is, that enclosed car cabins were olfactory protection from the smells of the driver, and the environment where horses were still using the road, and it stank like a barn stall that hadn't been mucked (and remember, there were flies everywhere landing on that manure, then landing on people)

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