I worked on Fuchsia engprod for a while. I am still employed at Google and can't talk about anything that isn't publicly available already (which really means anything gleaned from commits to the Git repo).

I think the best way to look at it is like any software: there's Fuchsia The Artifact (thing that is made) and Fuchsia The Product (how thing is used, and how widely). I don't know anything about operating systems, but my understanding is that the engineers are very happy with Fuchsia The Artifact. Fuchsia The Product has had some wandering in the wilderness years.