Sites don't want to bust the experience for brand new devices I think. That would include things like internet cafes where you log into a clean desktop environm

Sites don't want to bust the experience for brand new devices I think. That would include things like internet cafes where you log into a clean desktop environment, or browsers you use rarely like maybe one in your car. I think if Google can just get a real disk-backed implementation working for Incognito mode, such that there actually is no difference between Incognito and a new regular browser, this feature will be valuable.