To start; I said does nothing useful, not does nothing.As I have a black background anyway, dark mode makes no difference to the appearance of the home pages,does make Apple maps hideous.
it is a matter of supreme indifference to me what colour my contacts list is, messages look a lot better in light mode Safari does not change,etc. My fingers are to big to use slide mode to type,(and I notice it does not work on here).
The old workaround(colour inversion).
An interesting sidenote is that the dropdown text message notification is now a very nasty shade of, shall we say weak orangeade ?
As I said, nothing useful so far...