It'll be an incredibly risky decision to go with buck2 today, but it's so darn zippy in comparison to Bazel it's hard to not at least give it a real try.
My impression so far has been it's pretty robust in it's core, but anything that FB doesn't use is in a mediocre state. It's yet to be seen how willing they'll be to take PRs that are explicitly for community usage.
Their stated position is that they're interested in receiving them, and watching it play out in practice, so far, they've been very responsive. Both with taking PRs and for simply fixing issues by writing their own.
Time will tell though.
We're very willing to take PRs explicitly for community usage, with the standard caveats that it needs to be maintainable, testable, not regress other behaviours etc. But those shouldn't be insurmountable. Best way to tell for real is go through our PR backlog.
