Why do dogs wag their tails?

Some neuroscientists have postulated that "Scientists know that humans’ brains respond positively to rhythm, and because tail wagging is a rhythmic behavior, the authors suggest it could be that humans consciously or unconsciously preferred dogs that wag more." Read the article here: https://www.sciencenews.org/article/why-dogs-wag-tails-communication-evolution, and the research here: https://www.sciencenews.org/article/why-dogs-wag-tails-communication-evolution.