What legitimate reasons are there to use Fuchsia instead of Linux? The only reason I can think of at all is to be allowed to make proprietary modifications to it.

Security "Zircon is a capability-based, object-oriented kernel"

"The Zircon system fully isolates processes by default, and must explicitly grant capabilities and resources. Fuchsia passes capabilities and resources by handles rather than name, which leads to a system that only grants software access to what it needs."

https://fuchsia.dev/fuchsia-src/concepts/principles/secure?h...