I guess the comment wasn’t clear enough, because that’s absolutely not what I was saying.
“Problem with X” is not the same thing as “you should not do X”.
I’m also not getting why you think that I’m ignorant of Bazel’s origins, specifically, since I was talking about Borg.
You'd replied to a comment about build systems and bazel.
Regarding Borg vs k8s, it's worth noting that k8s was never built to replace Borg or to even try to match the feature set of Borg. There are some nice things about k8s (like the ease of running an entire cluster on your local machine), but since k8s tries to be all things to all people it's not even close to being viable (or competitive with what Borg can do) for Google itself.
If Google made a good build system with features not available in open source, eventually open-sourced it, continue to use it, and lots of other people are eager to use it, how does that demonstrate that they shouldn't have invented a build system?