I can vouche for .editorconfig. I set it up at my current job (although not to the degree in this article.)

The big problem we had was an old codebase, with a very inconsistent style, that had a lot of code written by junior developers and non-developers.

This resulted in a situation where, every time I had to work in an area of the code I hadn't seen before, the style was so different I had to refactor it just to understand it.

.editorconfig (with dotnet-format) fixed this.