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I think that's the main benefit by far - avoid useless debate. The icing on the cake is that I can write code in my style (tabs instead of double spaces, parens on new line, whatever) and then have my IDE or a CLI command refactor to the team style before putting up a PR, so it's really not an issue.

I usually default to some large company's style guide so it's difficult to argue against. For example, for .NET we use Microsoft's style guide for React we use Facebook's, etc.