I suppose a lot of it depends on what other traits the person has. There are plenty of jobs for people who are not that smart but are attractive, tenacious, and/or charismatic.
The problem with being, for lack of a better term, “dumb” is that by definition dumb people aren’t particularly creative or adaptable to complex or nuanced situations. I would imagine that they would be more likely to respond emotionally than intellectually to situations. And because they don’t understand complexity or nuance, those emotions might more often than not be frustration or anger.
There’s a lot more “living in the moment” vs thinking about the future as the simple-minded often can’t imagine much beyond “right now” or extrapolate how a situation may play out long term.
I kind of extrapolate what life for dumb attractive people might be like based on what I observe in reality shows on the Bravo network. For the most part, their behavior is what I would expect from someone who doesn’t give much thought into their actions. Their brains seem to operate in a very simplified sense of “I want to do this now so I should do this now!” Because those actions often come in conflict with some other littlebrain within their circle, it usually ends in some sort of fight or argument.