From what I've read Fuschia is not at all self-contained. The UI is fully driven by and targeted towards Google the search and ecosystem.
But those write-ups were years ago and there hasn't been new reviews with much UI focus since then.
But those write-ups were years ago and there hasn't been new reviews with much UI focus since then.
There is now a UI experience available as part of Fuchsia in the workstation product, but I wouldn't overly index on it as it's just one take on what you could use Fuchsia to build.