Posix lite didn't lose favor. It's still an important part of writing fuchsia native software. It enables us to use the c++ and rust standard libraries with minimal upstream changes. It was never meant to enable running all existing programs, only lowering the barrier. There isn't really much software that has been ported to run on fuchsia natively. Instead runners are implemented or ported and those provide the environment applications require. For instance a flutter runner, web runner (chromium), and starnix (a Linux runner of sorts) provide the basis of running many existing applications.
But the historical perspective is that Starnix is a relatively recent addition to Fuchsia. Even though Fuchsia is roughly 10 years old now, Starnix has only been useful for about 2 years (RFC 4 years ago)
Before Starnix came along to help run Linux apps, as you said, “There isn't really much software that has been ported to run on fuchsia natively”. Because POSIX Lite wasn’t / isn’t being used much. So I guessed the OP could have been thinking about that. But who knows.
