One thing it claimed was the ability to rewrite copy. Basically finally an improvement over spellcheck which has been the same for like 20 years. Would be nice to have something better built into the OS in every text field.
You could also have stuff like suggestions in your terminal when you’re starting to write a command based on what’s in the man pages and the layout of your filesystem.
Yeah, but that’s just the kernel. Anything above that (window manager, the utilities that they didn’t outright copy from BSD, apps, …) is basically closed source.