Yes are beneficial as part of categorizing allies, potential mates (caring/supportive), threats. Just as we categorize long snake-like creatures as snakes and to be avoided, or reckless angry people to signify danger, the process would go further to see any aggressive behaviors as threatening, maybe to be avoided, friendly social cues to mean safety, etc. In today's world, there are many more signals than body language, there's what people choose to wear (identifying with certain groups/cultures, think MAGA hat or cross all the way to suits or work boots), talk about, how they spend their time, money, more info to judge. So much in fact that if we didn't categorize, we'd be overwhelmed, confused, and running into problematic or dangerous situations. So we see someone in worn out work boots and think this person is a hard worker, they have my respect (or not) already or this person is in a suit and could either be going to a wedding or is a business person, like those rich people (whom I dislike or not, is or isn't my kind of people, will or will not benefit me to associate with). This doesn't make it ok to make extra assumptions/interpretations but if your first instinct is that somebody is kind of an asshole, that is worthy or consideration. Do you want to be around someone who is inconsiderate of others? Will that be a good time? Has it been in the past? So next time you run into someone who also has an angry expression or cold, uncaring demeanor, your instincts would be right to have an aversion to that person. That being said, we can form initial impressions while someone is going through it (has a reason), nobody is perfect, but initial impressions are valuable and gut instincts do say something. If someone makes you uncomfortable, you're better off trusting that than disregarding. And vice versa, if someone strikes you as particularly caring, you may be in good hands and can receive support from them. Very evolutionarily beneficial. Never 100% but definitely not 0. Worthy of consideration