Note that this sentence was about browser-based integration tests. Browser automation has come a long way, but even on very frontend-fluent teams I've been on we had a few flakey tests, and browser-based integration tests are sometimes flakey in ways that are difficult and tedious to debug! Not understanding why doesn't necessarily indicate any lack of understanding of DNS.

But maybe it increases the odds of a "Let's understand Playwright!" post in the future!