The Bazel one made me chuckle - I worked at a company with an scm & build setup clearly inspired by Google’s setup. As a non-ex-Googler, I found it obviously insane, but there was just no way to get traction on that argument. I love that the rest of this list is pretty cut and dry, but Bazel is the one thing that the author can’t bring themself to say “don’t regret” even though they clearly don’t regret not using it.