In macOS 10.14 Mojave’s Finder, you can put a single-tabbed browser window in spatial mode with View > Hide Toolbar (⌥⌘T). Spatial-mode windows look different: not only is the toolbar hidden, the sidebar is hidden and the status bar is moved to the top of the window. Opening a folder within a spatial window will open that folder as a new spatial window.
Hiding and re-showing the toolbar used to be easier in previous macOS versions – there was a “pill” button in the top right of each window that would toggle toolbar visibility. The removal of that button might suggest that Apple isn’t planning a resurgence of the Spatial Finder.
Some of the other features in this article have been added to Finder over the years. Finder now has Labels, back/forward buttons with history, Spotlight search that looks in metadata as well as the filename, and Smart Folders that contain saved searches. There are plenty of other features it doesn’t have, though, like Pop-up Folders, advanced bookmarks, an editable address bar, Finder Plug-Ins, or the ability to display custom file metadata in columns.
I looked at the latest version of Path Finder, a third-party file browser with many features Finder doesn’t have, and was surprised to see that it has no form of spatial browsing. It does, at least, have some other features described in this article that today’s Finder doesn’t have. Path Finder’s Drop Stack is a lot like the Shelf described on page 7, though Path Finder’s version is not unified with the clipboard. And like the idea of saving Finder Browser windows as files on that page, Path Finder supports saving browser window configurations with File > New Browser > Save Browser…, then opening a new window with that configuration.
Some features not asked for in this article that you may not have realized Finder has: