As far as I know it still isn’t implemented. I personally like the community plugin “Quick Explorer” as a workaround. It can launch a file explorer from the vault or from the current folder. And then you can navigate that list with keyboard, or begin typing the name to jump alphabetically.
(And if you search from folder, you can still navigate up and down the hierarchy.)
It isn’t a real solution to this request. You have to invoke the navigation each time. It isn’t meant as a way to go next, next, next, previous, etc. But it’s useful for me as a workaround.