character encoding issues broke the purchase flow for a customer with a non-English character in their name
Kind of off-topic, but coders introducing this sort of bug should be punished with the same bugs happening when they type K, W, Y, or apostrophes in the software that they use. Just for shits and giggles.
I'm [half-]joking with the above. Serious now: I'm an outsider but it's easy to notice that the software industry is eager to ditch things that are traditional, working, functional and well tested, just for the sake of appeal to novelty: "its old so I assoooooome dat is outdated y u live in past? lol lmao REEE!". And that applies to quality assurance.
...except that you can't trust someone to judge the quality of their own brainfarts. You need someone else to do it for you. And do it before the brainfart affects the lives of someone else outside your business.