What is interesting about Fuchsia is how Google first created Flutter and made it popular for Android/iOS and to a lesser extent the web. And now they start releasing Fuchsia OS/devices and developing apps/software for it will immediately feel familiar to many mobile developers.
This could help adoption instead of yet another GUI framework to learn from scratch.
Huawei is doing the same kind of approach, make android apps compatible with their Harmony system.
I think everybody has learned from Microsoft and Samsung's experience trying to launch a new ecosystem without support for current application android ecosystems.
Similarly, free software running on proprietary Unix OSes became (during the years 1983 through 1991) very popular before any free Unix kernel started getting traction.
This could help adoption instead of yet another GUI framework to learn from scratch.