useTheme function need more explanation

[adrianrz]

When try to use this example in my project

export type AppTheme = typeof myTheme;
export const useAppTheme = () => useTheme();

This not overwrite defaultTheme with myTheme, I investigate the source code of useTheme and I discover that have a theme parameter that not is in the example:

export const useAppTheme = () => useTheme(myTheme);

[gedu]

Hey, it is optional to pass a theme to useTheme.

export function useTheme<T = MD3Theme>(overrides?: $DeepPartial<T>) {
  return useAppTheme<T>(overrides);
}

The ? allows you to pass an argument or not, and to make the example easy and straightforward, it wasn't necessary. Any suggestion?