Truth be told, I have a few issues with forks, particularly when they aren't maintained by and for a big and popular grid.
One issue is that the maintainer of a fork has to take over changes at the original in order to stay compatible. Especially if we're talking about a one-person project, the maintainer may be rather picky in what's taken over. For example, several forks that were created from OpenSim 0.8.0.* or 0.7.* did not implement the changes in vanilla 0.8.2.1 that led to basic Bakes-on-Mesh compatibility. This gives you an OpenSim NextGen that reports back the version number 0.9.1.0, but that doesn't support BoM at all, even less than vanilla 0.8.2.1.
Another one is that the development of forks may end quickly. NextGen is dead and gone. The once-popular German fork ArribaSim is dead, too. Just to name two. Both were discontinued before even implementing BoM.
If your fork dies, you can be lucky if there's a way to migrate your grid to vanilla. If there's none, you can choose between going on running an increasingly outdated grid with gaping security holes and no support for any new mesh body version that came out in the last two and a half years and re-installing your entire grid. And the feasability of the latter depends on whether IARs and OARs created with the fork are still compatible with vanilla. If too much has changed, have fun starting over from scratch.
I do hope that the NGC developers won't quit anytime soon, also because that'd mean that the Fire and Ice Grid would be one of the next to sit on a dead fork.
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