See: https://github.com/bitwarden/browser/pull/24

One question: Why is Zig implemented in C++? What was the reason behind the choice?

It's mostly C, with some templates sprinkled in.

Zig depends on libclang and LLVM. Both of these are C++ APIs. Both expose a C API wrapper, but with not all features exposed that zig needs to use.

Question: when installing FreeBSD 11, I can automatically encrypt the disk in the install if I use ZFS, using UFS doesn't work, I would have to do that manually. Why didn't they implement this already?

I think the encrypted ZFS installer bits were upstreamed by PCBSD which is ZFS-only; so it would make sense for them not to implement the UFS version.

Apart from that, probably nobody needed it bad enough to sit down and write it so far.