It's absolutely infuriating. It could be such an awesome accessibility feature if it wasn't force-enabled by default. But what we get instead is YouTube engineers assuming that everyone just speaks a single language and needs auto-translations on every video. For every channel where this feature is enabled, I have to keep switching back to the original English audio track on every single video because YouTube knows that just because my primary browser language is set to German (the secondary language being English, btw), I am incapable of understanding the original audio track, of course.