MacOS has intentional holes in keyboard support. You have to go into settings and turn on a config for keyboard navigation to reach all elements. Apple intends for most users to navigate with a mouse.

It’s in the accessibility settings.

https://support.apple.com/en-za/guide/mac-help/mchlc06d1059/...

I cannot think of a single reason these would be disabled by default other than Apple stubbornness.