It's not a matter of not knowing how to do it, that part is easy. It's the lack of options or a clean way to replace an existing wallpaper without adding a new

It's not a matter of not knowing how to do it, that part is easy. It's the lack of options or a clean way to replace an existing wallpaper without adding a new lock screen and re-customizing. E.g., clicking the share sheet from photos and choosing "Set as wallpaper" creates a brand new lock screen instead of just replacing your existing wallpaper. At the very least, it should ask which option you want to do.