> I notice that people who insist on mandatory use of code formatters don't actually write code that much. So they don't care that their code gets reformatted.

This feels completely made up. As a reader of code, auto formatting makes my job slightly better due to consistency. As a writer it's a huge improvement. Not needing to think about where to put newlines and the like lets me focus on what actually matters.

My experience is similar to the author's - most people who are against code formatters change their tune quickly if you can convince them to try it.