If the only antiquated defaults are the ones you listed we're not in a bad shape at all...

Curious about light/dark mode, what does it do more than loading a theme? something like circadian.el? maybe it's because I hide menu-bar/tool-bar/scrollbars by default but `M-x load-theme modus-operandi` is all I need for whenever a room is too bright or a colleague complains about my dark theme.