> I would wager a sane default is to use the localisation of the operating system, as that is largely going to be localised for the person already
I already explained why in many parts of the world this would not be the good wager you think it is.
>moreso than browser fingerprinting(?)
I'm not saying browser fingerprinting is a good way to determine what language to serve to the user.
I'm saying setting the headers to non-default values (and especially ones that represent actual facts about the user, such as what languages they can be expected to understand) can be used for fingerprinting, and that's probably the most sensible reason to avoid making use of such features that otherwise would have been, as you say, benign and quite convenient.
>I'm not entirely sure why you are coming across as deeply emotional about this topic, but it's really not worth getting angry over.
I'm not getting angry! I am having fun fun FUN! Your culture requires me to be having fun fun FUN in order to not be gradually destroyed from the inside! Or from the outside!
That's an interesting point. However, given that this is a language preference users are quite likely to manually select the correct language if the incorrect one loads up. At which point you have shared that information anyway.
I guess there's an argument to be made against blasting that information out to every last third party though. Perhaps it should only ever be sent to the target that appears in the address bar.
I already explained why in many parts of the world this would not be the good wager you think it is.
>moreso than browser fingerprinting(?)
I'm not saying browser fingerprinting is a good way to determine what language to serve to the user.
I'm saying setting the headers to non-default values (and especially ones that represent actual facts about the user, such as what languages they can be expected to understand) can be used for fingerprinting, and that's probably the most sensible reason to avoid making use of such features that otherwise would have been, as you say, benign and quite convenient.
>I'm not entirely sure why you are coming across as deeply emotional about this topic, but it's really not worth getting angry over.
I'm not getting angry! I am having fun fun FUN! Your culture requires me to be having fun fun FUN in order to not be gradually destroyed from the inside! Or from the outside!