All this would be true if Linux and FreeBSD had similar exposition. But there's obviously less users and less hardware in the BSD world, so we must expect a higher variance.

For instance, searching in recent FreeBSD issues, some hardware is compatible but 3× slower, as in "NFS is much too slow at 10GbaseT"[^1]. Or a FreeBSD upgrade to v14 could sink the NFS performance, as in "Write performance to NFS share is ~4x slower than on 13.2". Of course, these bugs happen with Linux, but there are vastly more resources to detect and fix these problems in the Linux world.

[^1]: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277197

[^2]: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276299