Discoverability is a holy grail. With a list of features that has been expanding since 1984, you can't expect them all to be discoverable. And this one isn't a very frequent use case for normal users.
KDE does have a different target audience from macOS and Windows, but even as a dev/architect/sysadmin, I'm not sure if I would have found it. I've got a GNOME setup at work, but no idea if it has a similar feature.
As a person, who is using Mac for close to three years, I have to admit that discoverability of keyboard shortcuts (or even existence of such - navigating apps' menus, for example) on OS X is close to zero.
> And this one isn't a very frequent use case for normal users
The Finder's Go menu seems like a reasonably discoverable location.
That being said.... I kind of wish you could type and tab-complete paths in the Find window (cmd-F in the Finder) and Spotlight (cmd-space in any app.)
