It doesn't matter if they were intentional. The author mentioned there may hav been hundreds of these "oops" events. Assuming it wasn't intentional, Google knew there was a problem and chose not to fix it.
"Fool me once, shame on you. Fool me twice, shame on me."
Or in Google's case, "fool Mozilla a hundred times..."
IE6 was a browser of the same era as Netscape 4, when it was common and unsurprising for a CSS error or a malformed bit of HTML to crash the browser.
The idea that YT or any other Google product team would justify not CIing against IE6 or Firefox is absurd to me.
Can you elaborate? I kind of agree on the Kubernetes part in that it's really biased towards Google-scale, but I fail to see such biases in Go, despite having used it as my primary language for 4 years now.