This is why I'm in favor of auto-formatters like Black for Python. Nobody really likes it, but nobody really hates it either and you get used to it. What this does is that it completely removes the style component of the discussion, leading to better and more content-wise discussions of the code written.
Otherwise, it may be convenience, as I don't have to maintain consistency manually. May be, because in languages where there are multiple syntactic ways to do things (Python, JS), I want flexibility in emphasizing things. (Even if I don't overuse it.) It's hard for people who came up with formatting to predict everything what can be done in the language. People may use more imperative, more functional syntax, mix things etc. This may be even warranted in the context.
Of course, you can force a particular set of idioms, but this again becomes shifted to the context of a project or organization. In languages where the syntax is more uniform, it's easier to standardize formatting throughout the whole ecosystem. And indeed it is standardized in Lisp and Go for example - not in the C family for probably historical reasons.
languages where there are multiple syntactic ways to do things