That’s fine as long as it’s open source and a self-contained local piece of software (as Fuchsia is). The problem with Google killing products is that they’re closed source and/or require huge server resources and/or ML models.
Operating Systems are not a very well defined subject. Linux doesn't include a UI layer for instance and that isn't considered a problem. Being tied to a particular experience limits the potential applications of the OS, so in many ways I would consider the lack of opinionated experience a good thing.
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.
Google's proclivity for aggressively wiping the spaghetti off the wall is starting to work against it. I think maybe they need to start promising to open source any products they lose interest in.