They can't even add "respect the user's preferred language" to the AI assist prompt in Google Search - I've reported it countless times. Turns out, looking up local places/names/etc, does not mean I speak that language. They can't seem to add light/dark support to Gmail despite prefers-color-scheme CSS media feature being present in browsers for at least 6 years). I have zero remaining faith in Google's ability to do anything.
Gemini answers me in Mandarin quite often. In case their is any wonder about me: I grew up in the US and my first language is English.
Google appears to be especially bad at this (looking at you, auto-dubbing YouTube) and countless others fail as well.
What is it though? Is it a harder problem than I think it is or is Conway's law getting the better of the G?