As a marketing person, I can confirm that they can often be a useful abstraction, particularly when collaborating with people who need to get the general direct

As a marketing person, I can confirm that they can often be a useful abstraction, particularly when collaborating with people who need to get the general direction of an audience, but aren't necessarily data nerds who need to be intimately familiar with the detailed demographics, psychographics, technographics, behavioral data, etc. They absolutely have limitations and can overly simplify things to a fault sometimes, but as long as everyone gets that it is a representation and not the absolute, they can help streamline things.