It is not. It is open source, there will be updates when there will be updates, they are not pressured by board of directors to release something that doesn’t work.

I suggest checking the discord for more information, including endless stream of screenshots, to get an idea about state of the project.

I have edited the comment above to add link

https://sourceforge.net/p/flightgear/flightgear/ci/next/tree/

This random git repo I picked from their source forge page seems to have some pretty recent commits. I’m guessing they just have a slow release cycle.