There are kids out there with tab width 16 you should be grateful
And there’s also people who use tabstops of 3.
You can use a tabstop of 4, or 2, or whatever you want. It's not a problem. Don't need to use 8.
But the formatter will still line-break the code as if the tab width was 8, which will lead to lines with several lines of indentation being too short.