Author here! That opt out issue is definitely not intentional, I just gave it a quick try and it worked for me in a few different browsers. Feel free to ping me on colin AT ashbyhq.com with any additional details and I'll see if we can get a reproduction.

We only hire engineering managers that are deeply technical. This gives us more ability to work closely with engineers and make sure they're using new tools in the ways we want. It's not perfect. Sometimes, it goes wrong. But, that's why we continuously add tests and other tools to help us spot mistakes.