either you don't use macbook or not interested enough to look for how to change that behavior. It is a single flag in preferences that allow you to use the keys as function keys and screen brightness etc. with 'fn' key.
I know, but that doesn't make the F keys a good choice for cross-platform app developers. Nobody would release a web browser on macOS where F5 is the only way to reload the page - not before and not after the TouchBar.
