I worked on a project where I was responsible for implementing accessibility and multiple language support for a government adjacent site. I used Accept-Langua

I worked on a project where I was responsible for implementing accessibility and multiple language support for a government adjacent site. I used Accept-Language to decide which of our supported languages to use as the default. The PM over-ruled that decision and forced a EN default. The accessibility auditor put "use Accept-Language" into they audit report as a "red" item and then ripped the company a new one when they found out it had been initially implemented that way but then reverted. I got another couple of weeks of contract work for this and other such stupidity.