There was a really amazing reddit post about how the suit was basically a costume of the western world that served the purpose of lending legitimacy to men who wore it, and how it had been so successfully paired with the ideas of success and dignity that other cultures with completely different fashion histories had adopted it wholesale and even supplanted their own traditional garb with the western suit as the outfit of status in their culture.

I lost the link to that thread at some point, and I could never find it again. But anyways, the point was the whole design of the suit was one of theatrics. Nothing about it is functional, it's just a piece of costume that has rolled over from previous generations. So, ties.