Sure, fail the entire build because of a formatting problem. Hey, wouldn’t it be cool if we could stop that from happening? I don’t know, maybe by also adding in IDE specific formatting files? No? Oh. I wasn’t aware we could only have formatting files OR a CI format checker. 🙄

None of these things come at the expense of others. You can do both. Even if it’s part of the local build process I’d much rather know in my editor than on the terminal. And you may say “just have everyone do the same setup” to which I’d wonder what sort of magical land you live in where everyone always follows those rules and/or you can get buy in from management to spend that much time bike shedding and why you’d prefer either of them to just adding the damn file to version control to avoid it entirely.