This would be fine if all computers were guaranteed to be personal computers that know their current user's preferences. But they're not. Library computers exi

This would be fine if all computers were guaranteed to be personal computers that know their current user's preferences. But they're not. Library computers exist. Shared office computers exist. Internet cafes exist. Let's call these "kiosk computers." The optimal way to balance access needs here, IMHO, would be for either Operating Systems on kiosk computers, or maybe specifically browsers on kiosk computers, to offer a very quick, session-ephemeral toggle for what language the current user wants to see UI and content in. (Probably, given that kiosk computers are almost always left on default settings of the OS, while personal computers are, well, personalized, such a toggle should be on by default, with users of personal computers expected to disable it.) But until such a time as that ever happens, I would expect that websites will continue to simulate this thing the OS isn't offering.