They often have different personalities. Also: Marketing has a measurable outcome. Lawyers work like slaves (very well paid ones) and have a measurable outcom

They often have different personalities. Also: Marketing has a measurable outcome. Lawyers work like slaves (very well paid ones) and have a measurable outcome. Politicians do a lot of marketing / fundraising. Programmers don't always measurably see the value of the things they create. Especially on a large team. This obviously depends on the product.